Posts Tagged ‘welding’

Caution While welding Fuel Tanks

Friday, November 4th, 2011

Welding is a process wherein two or more metal pieces are joined together in heavy manufacturing. A molten solution is used to form the bond between these metal pieces and this particular molten solution is generated from tremendous amount of heat and light energy. It is quite dangerous when we get exposed to such intense energy transfer and we ought to practice caution at all cost. However, we our steps regarding caution have to be more vigilant especially when we are welding fuel tanks. There is a possibility of igniting fuel vapors and if MIG or TIG Welding processes are employed, the argon gas could suffocate the welder.

  1. Before welding, the welder should ensure that the battery is disconnected and the ignition mode is in switched off mode.
  2. Completely drain the fuel tank into an approved gas container.
  3. Once step 2 is done, remove the tank from the vehicle and see to that proper ventilation equipment is adopted while you start to weld the tank.
  4. After removing gas tank from vehicle, wash the tank several times with warm and soapy water. Do not dispose off the water and see to that it is properly stored in flammable container.
  5. Start evacuation of fuel fumes using an air hose for more than an hour until you are guaranteed that all fumes are evacuated and there is no longer detection of fuel fumes.
  6. Follow all safety standards before you start to weld and stick to the contract specification while performing the welding. After welding it, allow the tank to cool down for a desired temperature as per the specifications.

Once the tank has reached desired temperature, test for the integrity and quality of weld. Test for detection of any leaks which can be done by placing a small amount of fuel in the tank. If it is leak free, reattach it to the vehicle.

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Variety of MIG welding Transfer Types

Wednesday, November 2nd, 2011

There are predominantly four different transfer types of MIG welding.

  1. Short Circuit transfer
  2. Globular Transfer
  3. Spray Transfer
  4. Pulsed Spray Transfer

Short Circuit Transfer:

In Short Circuit Transfer the welding wire touches the metal. Electricity courses through the gun and creates a short circuit. The welding wire is melted and it drips on to the metal surface creating a puddle that creates the joint between the work pieces. Carbon dioxide shielding gas is used in this type of MIG transfer with a combination of low voltage. Minimum amount of shielding gas is required and this makes this transfer type an inexpensive process.

Globular Transfer:

Globular transfer happens with a combination of high voltage and argon shielding gas. In this type of MIG transfer, the wire melts down, gets collected at the tip of the gun and drips onto the joint only a few times per second. The main disadvantage is that this type leads to spatter.

Spray Transfer:

In this type of MIG transfer, the wire melts into very fine droplets and rather gets sprayed on to the joints like mists. It makes a hissing sound unlike crackle or popping sound of the Short Circuit and Globular transfer types respectively. It is resourceful for creating clean arc between the gun and the materials to be welded. It is achieved with a combination of high voltage and argon shielding gas or gas mixture that contains 15% of Carbon dioxide. The shielding gas is quite expensive as it involves high argon content.

Pulsed Spray transfer:

This process requires high end MIG welder. The welder pulses the voltage instead of giving steady flow of voltage. The result is a transfer type that alternates between spray and globular types. It doesn’t require high voltage supply to weld products. This creates more efficient welds and incorporated greater flexibility with positions. The MIG welder is quite expensive to give such a functionality and performance.

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Helping to eliminate clutter in the welding shop

Monday, October 17th, 2011

If yours is like mine, your welding shop may be cramped for space. If you have your TIG welding torch cables crossed with extension cords running to a grinder, or had to move everything out of the shop to work on the latest project, it might be a good idea to eliminate some of the clutter. Streamlining your operation from a logistical point of view will help free up space, reduce stress and improve productivity.

As mentioned, one of the most common issues faced is crossed up welding cables and extension cords. When working on a project, it so easy to do, when going back and forth between tools, and projects. You may suddenly pick a tool and find a mass of wires and hoses to deal with. One way to keep things organized is to either have multiple outlets added across your shop, and multiple air outlets plumbed around the perimeter. You might consider having multiple drop outlets that hang from the ceiling.  Even in a small shop, having multiple points close to the work prevents repeated plugging and unplugging and detangling of cords, improving productivity. This option definitely has expense involved with it, but it’s a good way to get things up and out of your way. If you are limited to only a couple of outlets that have to share duty, all is not lost. Having a couple of inexpensive “cable” organizers helps with not only the space issue, but  also keeps things tidy and safely stored. These organizers need not be more than an old steel auto wheel with the tire removed, mounted to the wall. I have found that the steel or plastic water hose hangers that you mount near your outside water faucet work quite well for hanging air hoses, and wrapping up extension cords, unrolling only the needed amount. These work particularly well for keeping TIG torch and stick torch leads  up and out of the way. For work tables, a small open hook may suffice on which to wrap and hang excess welding cable, until needed.

Keeping all your welding consumables and grinding consumables can be a challenge as well. Consider purchasing small stackable plastic sliding drawer organizers commonly found at your local “box” store to keep your MIG and TIG consumables in. The ones with the see through drawers are the best. They also make neat storage for grinding wheels and cutting disks as well as a handy place to keep your welding helmet cover protective cover lenses in. For just a few dollars, you can keep up with everything, all in one small, convenient space.

There are other inexpensive organizers as well to keep various welding supplies in a tidy condition. Keep in mind welding rod organization as well. Short sections of PVC pipe capped on both ends without glue can keep welding rods stored neat and dry. Inexpensive  welding rod storage tubes may be purchased as well which provides a tight seal against moisture ingress.

Consider putting up a small metal rack (if you indeed have the space) where you can keep odd scraps easily at hand. This will get it up off the floor. A simple  rack with  arms or slots down one or both sides with two to hold the metal is sufficient and economical to construct. Just be sure the base is properly supported so it doesn’t  bend or fall. If you can do that due to space, consider a kitchen trash can to keep odds and ends in stored vertically. While it’s not ideal, it does keep the metal from scattering across the floor, and you can spend a little time rummaging around in it when you need just the right piece to complete a job.

Although every shop is different, it’s important to get your shop organized. Organization helps reduce accidents, and improves operating efficiency. Less shop clutter will enhance the work experience, and lessen stress. Even if you aren’t the best organized  person, just little effort toward organization can yield  impressive results.

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Fumes: a hazard of welding

Friday, October 14th, 2011

Can you hold your breath while welding?

There is no doubt that we run into health risks every single day. As some people wryly joke, everything causes cancer in the state of California. Whether you accidentally eat a seed in an apple or you drive your car to work, you face a certain risk to your health. There are government agencies who sole purpose is to regulate and eliminate health hazards in both the home and work.

hold-your-breath

Hold Your Breath While Welding?

The welding industry is no different. All welders at some time or the other a will be exposed to welding fumes.  These fumes can have some nasty side effects to be sure. A common issue related to welding is “Metal Fume Fever” which results from breathing in galvanized metal fumes as it being welded. It can cause mild to severe flu like symptoms. Zinc is the primary culprit as it is the primary component of galvanized metal. The tell-tale signs of a crusty white or yellow powdery substance along the edge of the weld indicate the presence of galvanization.  Rarely does it cause anything more severe, but it can be nasty and briefly debilitating. If you suspect having metal fume fever, get medical help immediately because occasionally things can turn deadly. With that said, since it’s a necessary part of our diet, it is usually self-correcting. But other metals can be present with the Zinc, such as lead and those are the ones you need to worry about.

Hexavalent Chromium is another issue encountered with welding Stainless Steel. Breathing this may not show any immediate effects. But it is a dangerous by product of Stainless steel welding. Keep this in mind while welding anything you suspect to be stainless. Cancer, and asthma are serious side effects and may not show up until years down the road. Some people discount the potential risk, saying they have been welding stainless all their life, and nothing has happened to them. Well, not yet anyway, right? Dead people do not speak.

A related issue is the accidental or intentional use of brake cleaner, or any chloro/flouro carbon based chemical as a metal cleaner before welding. Welding on a piece of metal that was cleaned with brake cleaner releases phosgene gas, a substance used in chemical war fare. Inhaling just a drop of vaporized residue could kill you or leave you seriously sick. Usually it’s a painful death that ensues over the course of days, if not months.

There are other risks from breathing smoke and fumes from all welding processes in general. Cancer is a real risk, especially, for those who already smoke or abuse their bodies with substances. Heart attack chances can increase as well. The complete carcinogenic effects of welding may never be fully known or understood. However, breathing all welding fumes should be minimized at all times. Open areas are the best.  Having a fume hood, or fan with open windows is a good way to fend them off indoors. If you are concerned with smoke while welding, try slowing your breathing or holding your breath before you start welding. This is not fool proof by any means, but it can help minimize exposure to those who are making short welds. Yet, for some, none of these measures may be a practical solution.  The welding may have to be done down in a tank where there is not any relief or escape. For many, a respirator is the only solution.  They are not cheap however, and before purchase, a little research will need to be done on compatibility with your helmet, and headgear. However, though they can be bulky and hot, a respirator might just be the thing you really need for a lifetime of worry free welding. Minimization, if not elimination to exposure is key to enjoying a long life of safe and happy welding.

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Setting up a welding shop: The basics

Wednesday, October 5th, 2011

Now that the economy has hit a low, and unemployment has risen, a lot of people or looking at alternative means of income. Granted, a lot of people will find new jobs somewhere, but others will be forced to create their own job by becoming a small business owner, and finding their “niche”. One of the “niche” areas that many people are finding wide open is the need for small welding shops in their area. Of course, many areas are served by large machine shops with $100.00 an hour rates plus materials. However, the average person may not find that a reasonable charge to repair a small household item or to have a small project fabricated, since a small project could easily run into the thousands of dollars. There is a clear need for small repair shops that can handle small jobs, without incurring the same kind of expense that a customer would find at a large machine shop. Some machine shops will actually turn down work if it doesn’t meet a minimum dollar amount. If you perceive a need in your area for a small shop that can customize small repairs, and engineer small projects for a customer, then you may be thinking about what you will need to get started.

Outside of the obvious need for a welder, you will need to see how many welding processes you can afford to have, and you must evaluate the space you have to have them. TIG welding is probably the most expensive process to have in your shop, but it is also the most lucrative, especially when it comes to welding aluminum. MIG of course seems to be the staple found in almost every welding shop. Stick, is the preferred choice for mobile repairs. A plasma cutter is popular for cutting metal, but is not a requirement for many small shops, as long as there is an Oxy/Acetylene setup available. Each process carries with it a demand for space, money, and skill. Be sure to evaluate which processes best fit your operation best in the early planning stages so that you can go after customers that have needs that you can fill with the processes you can provide.

Shop location is another consideration. In a rural setting a small welding shop may be a small pole barn or even a home garage. In more urban areas, it may be a small store front with a side roll up. Or even, the welding operation may be completely mobile with an Engine drive welder providing both welding power and electrical service to the job site. Whatever the location, or arrangement, a well equipped, convenient to access shop and operation is critical to having credibility. Keep in mind legal requirements for insurance, business license and applicable permits and general code requirements when in the planning stages as this will require a significant amount of capital that is often left out of the business budgets when it comes to writing a business plan and assigning an overhead cost to a shop location.

Well-equipped shops often bring customers back for more business. Even if you don’t have the money for the most expensive tools, used, or lower end welding and machining tools can suffice. If a customer goes into a shop and sees maybe one name brand welder, and an oxy acetylene torch, it may not convey a lot of confidence in the customer’s mind. Rather, most customers like to see a fully equipped shop with the expected pieces, like a band saw, chop saw, stationary grinder, hand held grinders, full length floor drill, jacks stands, welding table, small lathe, vises, clamps etc. Especially don’t forget the all important wrench sets, pry bars and hammer sets. As long as these work, name brand won’t be important to the customer. While it may not be possible to sink a chunk of change into all these at once, prioritize your purchases and leverage your buying power at estate sales, and discount tool places so that you can get the most shop “bling” for your money.

Overhead costs are the most manageable when they are in the planning stages. When you are planning for them, then, you are most likely to bid correctly. You may not win every bid, but having a realistic dollar figure for what it takes to operate the shop by the week or by the hour will save you a lot of heart ache and worry. Shorting yourself on bids by forgetting that monthly insurance premiums are due, and the need to upgrade equipment to finish a job won’t help you stay in business, though it may bring you a job you can’t afford to finish. This is never good and should be avoided if at all possible.

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How do I choose the right welder for me?

Monday, August 15th, 2011

If you’ve been thinking about buying a welder lately, then you’ve been giving some consideration to which is the best to suit your needs. If you are like most people, you may be confused by the wide array of welders on the market, and even likely by the terminology. You may be wondering what all those foreign sounding acronyms mean: SMAW,GTAW and GMAW. And you may hear terms like MIG, TIG or Stick thrown around…Without a point of reference these terms may just simply float by making your choice even more difficult and confusing. There are also many confusing numbers floating around out that with reference to welding. For example: ER6010, ER 70S-6, or even RG-60. Even the organizations surrounding and governing welding have a confusing array of Acronyms that they use. Ever hear of the AWS or the ASME? What does it mean to hold a certification, how do you get one and is it really important? Yes, there’s a lot to take in at the beginning, but after some of the confusing terms are sorted out, you’ll eventually be able to think your way through what type of welder you want for your next purchase. I’ll try to simplify and boil these down to the most basic and accurate definitions possible in the next few blogs for the most common welding terms. Hopefully you will be a more knowledgeable, informed and more comfortable purchaser. Even, though you may already know what type of welder you want and have many years of experience, there may be a thing or two you can still learn about welding and welders.

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Concentration as a key factor in welding:

Monday, June 27th, 2011

Have you ever imagined how the welding process actually works? Have you ever actually been involved in performing one? Do you aspire to become a professional welder? Firstly welding is a process or an art where two or more metal work pieces are joined together with the help of a molten solution which solidifies and forms a bond between them once it cools down. The process as such involves high electricity and intense heat transfer in order to generate the molten solution which is the basic essentially of joining.

Welding is a very easy process to learn and adapt to. It all comes down to mastering the art and making perfect joints which comes over a period of regular practice. The electrodes involved when touches the metal creates an arc which allows the molten solution to precisely hit the right areas to form a necessary bond. It is very important for us to control the arc in order to do so whatever is mentioned above. Thus concentration is indeed the key factor in performing perfect welding job. The more you concentrate the more control you can get in doing the job. Practice in deed makes a man perfect and efficient.

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Stud welding

Wednesday, June 22nd, 2011

Stud welding is a form of spot welding. Here all the energy is concentrated into one spot to create a weld. The specialty of a stud welding is that a bolt is especially created for the purpose of welding and a nut is fed into the bolt to form the weld. The bolts are very often fed into the automatic spot welder.  The weld nuts will have a flange that will meet with the bolt to form a weld. The stud welding is also known as a stud arc welding. This welding type joins a stud and a bolt together for the purpose of welding. A flux called ferrule is used in stud welding. This flux will concentrate the heat that is generated so that the welding can be carried out. These form very effective welds and make sure that sturdy bonds are formed. The most common applications would be shipbuilding bridges are other huge steel structures.

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Safety while welding

Tuesday, June 21st, 2011

On the most important aspects of welding today is safety. This is most important in case of amateur welding. Amateur welders are those that do not practice welding as a profession but rather as a hobby. These welders need to take the most care as most of the times; they are operating from their garage or their back yard. There are a few things that you should always have when welding. Insulated gloves are a must. This protects you hand when you are holding the welding torch. The next are the insulated shoes. This does not let your body conduct electricity in case there is a shock or a short circuit. The next most important thing is the shield through which you look at the welding spark. This will protect your eyes from looking directly at the welding spark. This will also ensure that you can weld safely and prevent all kinds of accidents.

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How to avoid flash burns

Friday, June 17th, 2011

Flash burns are a common welding injury. However these can be avoided if proper precautions are taken. The flash burns are eye injuries that affect the corona. This usually occurs from the ultraviolet light that is emitted from welding torches. The corona will eventually heal itself over time but if left unchecked and unguarded these can cause serious infection and injury. Therefore you should make sure that you have adequate protection against such an injury to prevent it from happening in the first place. Flash burn can be avoided by using the ultra violet shield that is used for welding. By wearing proper welding masks that have shields to protect the eyes from ultra violet light, such an injury can be avoided. Also the welding goggles that are meant to block out ultra violet light will help to make sure that you can avoid flash burns and carry out safe welding and complete your project without injury to your eye.

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