Posts Tagged ‘TIG welding’

Fundamentals and advantages of tig welding

Monday, November 14th, 2011

Tungsten inert gas shortly tig is a type of welding which necessitates non-consumable tungsten. To put it in simple it is the process of merging reactive metals such as magnesium and aluminum. The space filler metal is added by hand. Tig welding fabricates clean welds that are of top-notch quality. Tungsten and weld is protected by the shielding gas. It allows welding of more metals than any other welding course of action. Through tig welding you can weld almost all types of metals like copper, stainless steel, bronze, brass, gold, and steel. It lets you to cool down or heat up the weld puddle.

Some of the advantages of tig welding:

This type of welding machine generates high quality welds by fixed control of the heat input through a base petal feature. Lesser measure of filler metal is included to the weld puddle, thereby it lets out little glimmering and spattering. The best part of tig welding is that it does not let out smoke or fumes like any other process. Unless and until the base metal restrains contaminants or elements such as oil, grease or paint. To avoid smoke the base metal shall be cleaned thoroughly before the course of action.

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Angle of the Dangle: Resolving welding issues with torch angle adjustment

Thursday, October 27th, 2011

A new weldor can often be plagued with curious and aggravating weld issues that often lead to a great deal of frustration. Even occasionally it will occur with seasoned veterans of the welding field as well. Often times occurring after a long day of welding or when fatigue is likely to set in. These symptoms are not necessarily exclusive to only one type of weld process. They can occur while stick, mig, or tig welding when conditions are right. Symptoms can include inconsistent porosity issues, slag or silicone trapped in the toes of the weld, inconsistent weld bead formation, without fusing on both sides or piling of the weld on one side or the other, dirty looking welds or even large amounts of spatter.

All these issues can usually be traced to improper torch angle. A weldor has to monitor two angles of the torch position relative to the work surface and the weld.

1.  The torch angle relative to the direction of the weld. If TIG welding, particularly noticeable in aluminum, a steep angle greater than 15 degrees from vertical can result in a siphoning effect with the gas flow, pulling in air from behind the weld in to the molten puddle. Usually the angle should be with the torch reclining toward the weld area already welded, with the tungsten pointed toward the front edge of the puddle. Also, the arc can be projected too far forward creating instability issues. The weldor can suffer similar issues while welding MIG as well. However, the torch can be pointed either in the pushing or pulling direction. Whether a forward or rear leaning approach is taken, the penetration and weld width will change. While stick welding too great of an angle causes multiple symptoms, including porosity, and weld rolling into the toes of the weld. In general the torch angle should “lead” the weld, and the torch should seem to be dragging the weld along. Again the 15 degree rule should apply.

2.  The angle relative to the sides of the weld should be monitored as well. This second plane is responsible for even distribution of the heat. Improper fusion of the weld will result or overheating of one side of the metal can be seen by following the heat lines. This angle can be manipulated however, to join dissimilar thicknesses by focusing more heat on the thicker material. However, when joining the same thickness of material the torch should be held vertical as possible to the weld with the torch/electrode even distanced from either side of the weld. This applies to TIG, MIG and Stick processes of welding.

As a new weldor, if you suspect you are seeing transient problems, inspect your torch angle. Many problems can be solved by concentrating on the torch angle. If they don’t resolve, then you should proceed to suspecting other causes of the problem such as contaminated gas, or dirty metal, or insufficient gas flow.

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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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Polarity: When should it be reversed? Part 2

Wednesday, October 12th, 2011

Using correct polarity makes the difference between a quality weld, and one that is porous and weak, or one that gets proper penetration, or one that barely gets any at all. Beyond the confusion of the terms, it is often confusing to know just when to use what polarity.

While stick (SMAW) welding, the great majority of welding rods require a positive polarity. In fact nearly all welding rods run primarily with positive, (reverse) polarity. With a few exceptions, in the case of running on thin sheet metal, you should always run with reverse polarity.  Since the term “Reverse” may be confusing, just always think “positive torch” and you should be ok. MIG welding is always going to be positive polarity. Some people confuse MIG with flux core welding.  They are not the same, though the equipment used can be nearly the same or identical. Flux core uses a wire that contains a powder flux in the center of the wire. It has its advantages in windy conditions, and offers go anywhere performance. While not necessarily better or worse than the MIG process, it does utilize straight polarity, just the opposite of MIG. There may be some wire manufacturers however that recommend positive polarity, so be sure to check the label. One thing to note, MIG and Flux Core wire do not have “optional” polarity with the same wire. If its positive, it will only run successfully on positive. Dual shield wire utilizes the best of MIG and Flux Core by using a flux wire and shielding gas. Always follow the polarity recommendation of the wire manufacturer of course, but generally dual, or outer shield wire uses reverse polarity.

TIG is the exception and is the process where it will always weld with the torch in the negative terminal (even if welding in AC mode there are reasons to keep the torch plugged into the negative side). Years ago, DC positive was used for welding aluminum, but penetration was very poor, and it required enormous diameter tungsten to weld at relatively low amps due to heat being maximized on the tungsten tip instead of the base metal.  Since aluminum welding is so easily accomplished with AC tig units with either high frequency overlay or inverter style welders such as the Everlast PowerTIG series,  DC negative torch polarity is the only one used.

Whatever the polarity, you may need to employ some sort of memory device to help you remember the polarity terms. Even if you have to write a note on your welder to help you remember the “torch” side that you will use, it will help you in get it right, and keep frustration down to a minimum.

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GTAW Process: Overview

Friday, September 16th, 2011

The Gas Tungsten Arc Welding (GTAW) process, commonly referred to as TIG, has long been considered a fine art form of welding. As a welding process, TIG welding, requires the most knowledge, practice, patience, and overall skill. Even many professional welders are reluctant to add the GTAW process to their welding repertoire due to the skill level and practice needed to thoroughly master.

GTAW Process

GTAW Process

Thanks to many of the reality fabrication and do-it-yourself shows and a sluggish economy, TIG welding has gained in popularity. A lot of people have suddenly found themselves edging toward owning their own business, whether it’s a motorcycle, rod shop, or even machine shop after watching non-stop marathons of their favorite fab show on the Discovery Channel or Speed Channel. One of the first purchases often sought is a TIG welder, as it seems to be the backbone of every DIY show on television, so naturally, it must be the backbone of the new shop. Right? Unfortunately, it’s also the very same purchase that brings the first dose true reality to newest Chopper shop to open its doors. It seems that TIG welding is not as easy to master as it seems. For some, the sheer cost of just getting started buying TIG welding related accessories blows the budget. The disappointment experienced by many not to be able to instantly weld is often a setback to getting the business going. Over the next few blogs, we’ll look at various aspects of TIG welding to offer some guidance and support to the person interested in making their first TIG welder purchase and getting their business off to a successful start.

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Welding jobs

Friday, June 24th, 2011

There are many jobs for welders today. Welders can be employed for quick fixing as well as large scale projects. The type of work that is given to a welder depends on the welder himself. If he is experienced enough to take on large scale project then such a project will be awarded to him. On the other hand if he operates on a small scale equipment basis then he would be the quick fixer for cracks and repairs. All that is required is the right equipment and time to develop the right skill. When people start with small equipment they generally take on small sized projects. Working on several projects like these improves their skill as a welder and slowly they move on to bigger projects. This helps in growing skill as a welder as well as a professional that would help to ensure that jobs are always found for welders.

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Protect yourself during welding

Monday, June 6th, 2011

Welding is an art where iron, steel and other strong materials are joined together with the help of a molten solution which when cooled down forms a solid bond between them. The molten solution is generated using electricity and high transfer of heat energy. As such it involves high intense sparks and heat in the whole process. This process is mainly done to manufacture planes, ships and other kinds of metal appliances and things we use on a day to day basis.

Welding is a very simple process to learn and perform. Anybody who has the likes for it can easily adapt in the industry. However, no matter how easy it might seem to be, it is certainly one among the dangerous activities pursued by mankind. As it involves tremendous amount of heat energy and high intense sparks, it can be quite harmful for us if we are not protecting ourselves with much care. The sparks can damage our eye sight and cause burns in case if skin is exposed to it. The fumes can cause lung and other heart related diseases if inhaled. People have even died catching fire while performing the art. Thus you must always take every necessary measure to protect yourself while you perform welding.

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What is welding?

Wednesday, June 1st, 2011

Welding is the process by the means of which two metals are joined through the application of heat. It is a common industrial process as well and can also be carried out at our homes for simple repairs. When the weld is made with a good forge, it is very hard to detect with the naked eye. Also the joint that is made though welding is strong and this can be used to make solid structures. There are different process associated with welding that increases the effectiveness of the weld. Welding can be used in many situations. This can include joining metals in a bridge together to form a strong connection to joining two metal rods in a window that would complete a structure. This way it has big and small applications. It is one of the primary methods meant for the joining of metals which helps to create strong bonds and connections between metals.

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Welding Training and Research

Tuesday, May 31st, 2011

There has been a lot of research in the field of welding. The use of welding to join metals has been so widespread that continuous efforts have been taken to improve on the standard and quality on welding. There has been a great amount of research that has gone into the whole process of welding which has resulted in welding becoming a staple and simple means to join two metals together. Today, the equipment that is available for welding help to create stronger joints and also the work can be done with more precision than it originally could have been done. CNC welding has become very popular in the industrial world today. There are many crash courses and workshops that are made for people who would like to take up their career as welders. The best subject to focus on would be CNC welding as this is the current scenario in the world of welding today.

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Process of welding

Monday, May 23rd, 2011

The primary process of welding is the creation of an electric arc between the electrode and the metal. This arc should be stable and maintained between the electrode and the metal. The arc is created when electricity is passed through the electrode. A consumable or a non consumable electrode can be used in the process of welding. The welding process melts down the metals and the two melted metals join in their molten form to form a slag. When this cools down, the metals are joined together where they were melted at and become one whole structure. This creates a strong bond between the two metals that does not yield to pressure or wear and tear. In case of a consumable electrode, the electrode might melt and form a part of the weld.  This will make the join even stronger between the two metals. There are many different types of welding used for different purposes.

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