Posts Tagged ‘types of welders’

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About Welders:

Wednesday, November 3rd, 2010

Welding helps in joining together two different metals. A welder has to go through apprenticeship before being qualified to be a full-fledged worker. A Welder can join metals such as steel, aluminum or copper together. They must maintain good dexterity and attention to detail as the job is relatively delicate.

The first gas welders began appearing in 1893, using different mediums to produce the best plasma discharge. The experimentation resulted in invention of the blowtorch, a device that allowed for a wider application through non-industrial needs.

A welder has to move through a series of stages in their career path. A welder’s apprenticeship is usually carried out through an accredited trade school. These programs last for two years, and give the beginning welder strong knowledge of the process, tools and materials used in welding. It also provides safety information that is imperative for a safe career.

Various dangers are associated with welding, some of which are also life threatening. Welders must wear leather gloves and long sleeves to lessen the impact of heat. Another problem is the bright light that is given off by the welder. It can cause damage to the cornea and ultimately lead to blindness.

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Welding Techniques defers according to welders:

Monday, June 7th, 2010

There are a number of universal welding techniques available, but most of the welding techniques depend on the method of welding which is being preferred by welder.

Operating circumstances of the welding is the main and prime concern because with the help of operating circumstances the factors concerning to the welding current, electrical energy, the velocity of arc travel and the wire electrode expansion are decided.

All the four things that mentioned above are measured essential change in every welding procedure because they will be able to differ over a long time. In order to make a replica of the similar performance, the standards should be verified at various types of welding activity.

In the welding process, welding current is the amount of power that is being utilized. For the welding current, a power source meter or a detach ammeter can be utilized. Welding technique and the quality of welding are affected directly via the situation of torch.

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Pipe Welding:

Wednesday, May 26th, 2010

When working for Silico Products, Naddir Patel noticed that despite the SAW process being highly efficient in depositing weld metal, some of his customers were experiencing significant downtime between processes. They also were getting burn-through defects because welders were not proactively measuring the inter-pass temperatures.

Selecting a different high-deposition power source, such as twin wire, tandem wire, or power wave source was not a viable option simply from a capital cost standpoint. Retraining welders and requalifying weld procedures also would increase a project’s capital cost. This high capital investment still would have limited versatility in a typical multitasking shop that makes circumferential welds on 6-in. to 42- in. diameters in various plate thicknesses.

A published survey indicated that increasing electrode extension would seem to be the ideal remedy for increasing production rates and decreasing the heat input.

Whereas earlier attempts to increase electrode stickout (extension) were not very successful or consistent, Patel found a company that produced ceramic nozzles that could be screwed onto the contact tip of the welding head to guide the hot wire without jamming it.

This simple ceramic nozzle allows electrode extensions of 3 in. or more without wire straying. It eliminated arc wandering, provided adequate weld penetration, and produced quality welds. As welding parameters were not changed (except for a very small voltage increase), there was no need to requalify weld procedures.

The electrode extension was increased in increments to yield deposition rate improvements of 45 percent without any radiographic testing (RT) defects occurring.

As the heat-affected zone (HAZ) was narrower, narrower grooves were designed for greater efficiencies and less distortion.

Tests found that a 3/32-in. electrode with a 2 ¼-in. extension could be used for normal welds on various material thicknesses. Heavy-walled welds were completed with a 5/32-in. dia. electrode.

Tests were conducted at various customer locations and on a variety of groove welding applications for both mild steel and stainless steel in a 350- to 650-amp range.

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Skills Required For Underwater Welding

Thursday, August 6th, 2009

Underwater welding is usually done underwater. Underwater welding is done for repairing ships, maintaining underwater pipelines and working on oil platforms. While welding underwater, welding operator generally wears a dive suit and uses welding equipment that is specially designed for wet environments. Welding equipments are designed in such a way that they are considered safe and reduce the risk of electric shock. A Person who does underwater welding should be a skilled welder and a skilled diver.

If you want a career in underwater welding, it is important that you have dive training and welder training. Some underwater welders acquire welding skills and then pursue dive certification. Some start as commercial divers who later decide to expand their career by learning welding skills. The training is generally based on safety procedures and people must pass certification tests to start work.

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Welding As A Career

Friday, July 17th, 2009

Demand for professional welding has increased in certain industries like aerospace, automobile manufacturing, pipefitting, power plants etc. Since 1994, there has been an increase in welding jobs. Most of the welders work in manufacturing, construction, or wholesale trade sector. Most of the welding jobs are done manually, but some require machinery. Welding equipments like arc, gas and flame torches can be used to perform various welding tasks. Welding can be done for any position such as flat, vertical etc.

If a person wants to become a welder, he should have good eyesight, manual dexterity, good hand-eye coordination, should be able to bend, stoop and work in awkward positions. Have the Ability to work for longer period of time and undergo training so that he /she can perform the task in a better way. If a person wants to become a welder, he should have passed high school or GED (General Education Development) and complete a formal training program. There are various training schools and institutions for welders. Various subjects in welding training include, blueprint reading, shop mathematics, mechanical drawing, physics, chemistry, metallurgy and computers. Welders should have basic knowledge in mechanics, production and processing, building and construction and also engineering and technology.

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Points to Remember Before Buying a Welder

Thursday, July 16th, 2009

Before buying welding equipment you have to remember certain things in mind.

First, decide on the size of the welder. Size depends on how much amperage a welder can generate while it is being used. Different types of metals require different types of amperage. More amperage is required to weld thicker material and less amperage is required to weld thinner material. The size of weld depends on the type of work. If you’re working on thinner materials like steel and aluminum, you will require 150-amp MIG welding unit. This will require 30 percent duty cycle.

Make sure that welding equipment is portable. While using portable welder, you will need power. Most of them can operate on 115v of power. If you use purchase high quality welder, it may last for many years. If you want the best welder,
it is advisable to shop from a welding supply store. There are professionals in welding supply store who will help you with their opinion as to which type of welding equipment will be appropriate for your type of work.

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Purchasing A TIG Welder

Tuesday, May 26th, 2009

TIG welding may be the slowest type of welding out there. But, it is also most precise and easily controlled. The most difficult problem that consumers face when buying this type of equipment is finding a setup that meets their needs and their budget at the same time.

Typically, TIG welders are divided into two categories—rectifier and inverter. Rectifier welders have been the most widely used for TIG work for a long time. These machines use a transformer or coils to generate the current used for welding. Inverters on the other hand have only been around for about the last fifteen years. But, they are growing in popularity and demand. A circuit board is used to generate the welding current in the case of inverters. One advantage of purchasing an inverter TIG welder is that they use less power than their counterpart, the rectifier. Consider the features of the following types of TIG welders before making a decision about which one to purchase.

Small Inverter TIG Welders (110-230v)

Most of these TIG welder systems come with the option to operate on 110v or 230v. However, the 230-volt option produces better results with a stronger and more controlled weld bead. Below you will find some options for available Small Inverter TIG Welders.

Thermal Arc 85: This is a very basic 110-volt welder that is a scratch start, meaning no remote start and a hand or foot option can be added. This welder is only DC and will only weld steel and stainless steel when in TIG mode, but can be used for some other applications in stick mode. Because of the price range and portability of this model, it is an ideal option for around the house and emergency welding situations.

The Miller Maxstar 140 series: Available in 5 different packages, so there are many more options to choose from. Again this is DC only so no aluminum TIG welding.  A perfect choice for around the house or where a small portable welder would be useful as in HVAC and restaurant repair and, auto body sheet metal repair; the Maxstar can operate on 110v or 230v.

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Types of Welding

Sunday, January 4th, 2009

Welding is still a very important part of work today. The auto industry, the military and many other industries use welding to bring together metals. Welding takes two pieces of metal and melts them so they can be bonded together.  There are many different types of welding but arc welding remains the most popular.

Welding actually dates back to ancient times and people have found evidence that it goes back to the Bronze Age. In ancient Egypt evidence of welding tools were found that date back at least 1000 years.

When the joints of metals are melted together they make a strong bond. This is necessary in many cases to make sure that products like automobiles will stay together when they are driving down the road.

The type of welding that is used will depend on the situation and the material being used. Most will use some type of torch that uses gas or electricity to make the weld. Some of the major types of welding and how they are done are listed here:

Propane torches — usually these are used when people have a smaller project to do. It is used to solder two types of metal together or when they want to sweat the joint. Jewelers often use this method when they are joining small pieces of metal in jewelry making.

Oxyacetylene torch– this torch is a step up from propane because it gets hotter and you can use it for larger projects. It is used when a very hot flame is needed. When a welder wants to braze, cut, solder or weld metals that require a very high heat to melt, they use this type of welding.

AC & DC Arc welders– this kind of welding is used for heavier gauged steel or when a project is using cast iron. Rods of flux coated steel or varied materials are fed through the welder unit and these are guided into the joint that is to be welded.

MIG also known as Metal Inert Gas — some welders prefer this form of welding because it is easier than other types of arc welding. A DC arc is used with a reel of thin wire. To make the weld, filler material is used and an inert gas is used to make the bond instead of flux.

Welding is a skill that many people possess and there is always a need for it.

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