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Aluminum gas welding can be accomplished with gas tungsten arc welding (GTAW) and it can also be used to weld steel, as well as other metals. GTAW is also called tungsten inert gas (TIG) welding. Welding steel is one of the easier jobs when using rig welding, but there are a number of factors, which make it much harder to weld aluminum.

From cleanliness, arc length, machine settings, welding with a dirty tungsten electrode, filler rod angle, type of electrode, torch angle and size of electrode – you have to be extra-careful with all of these factors when you tig weld aluminum.

Here we go over these factors and how you have to be much more careful with aluminum than with steel.

- Make sure that the settings for your machine are correct. Set your machine to use alternating current and the high frequency switch should be at continuous mode otherwise it will make the arc stutter.

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- A piece or object of aluminum left outside is likely to be highly oxidized after having come in contact with the elements. That should be weld only after thoroughly cleaning it – otherwise it will burn or weld extremely fast.

- Arc length – it is important to keep the arc at just the correct length. Arc lengths too long or too short, both should be avoided with aluminum. Too short the length, you your metal will jump on your electrode, damaging that and you. Too long a length and the heat will not be pinpointed enough to be of proper use.

- Keep your electrode clean. A dirty electrode will make the weld sooty – taking any fun out of the job you may have been having.

- Do not use pure tungsten electrodes with the new types of tig inverters to weld aluminum. The old types could use them, but not these new ones.

- You should keep the 1/16″, 3/32″ and 1/8″ sized tungsten electrodes within easy reach when working with aluminum. With steel it is one size fits all policy, where you can go with a 3/32″ tungsten for most of the jobs. But with aluminum, you need different electrodes depending on the thickness of the aluminum.

Aluminum gas welding just needs to be done with more care than other types of welding. Keep all these factors in mind and you will have your aluminum boat repaired or your ladder fixed in the best possible manner.

Let’s not escape it anymore. Each professional field in today’s times require certification and skills. The field of welding is no different. Even the field of welding and training requires certification of various kinds. Welding has its own types and certification varies according to that. For instance, pipe welding has different requirements to be fulfilled. This article aims at dealing with the detailing of pipe welding.

The organisation responsible for the pipe welding certification, the United Association of Plumbers and pipefitters (UA) has made a unique code for the same, i.e. UA-1, 2, 3, 4 etc. It goes on till the number 92 is reached. The common tests count up to 92 but there can be other possibilities as well.

There are several welding processes involved for the pipe welding like Gas Metal Arc (GMAW), Flex Core Arc (FCAW), Shielded Metal Arc (SMAW) and Gas Tungsten Arc (GTAW). If that was not enough, there are also different metal groups involved like carbon steel, stainless steel and aluminium. This is the reason that so many pipe welder certification exists for the varying sites.

You can refer to the ASME Section IX if you want to peep in to the certification requirements and qualification limitations. For the general purpose, we can assert that most common limitations are thickness, position and diameter of pipe. There are some limitations even after achieving the certification tests.

For instance, a welder who has passed the test of TIG on 2 inch schedule 80 pipe in a 6G position can weld 1 inch and grater diameter pipe. It can go up to 436” thick and then a welder can weld in all positions. Similarly, a welder having passed the test of 6” schedule 40 in a 6G position is qualified to weld till .560” thick and it can go down up to 2.875” pipe diameter.

The market welder qualification asks for a combo pipe welder. It is always beneficial to enhance your skill to make it to the best possible option. Obviously, if you carry both the skills of welding a TIG root as well as a hot pass followed by an E7018 stick fill and cap, it will be easy for you to get the job. The combo welders are able to weld with several welding processes. Companies choose TIG welding for the root and hot pass and stick welding for the rest of the pipe. Requirement can vary; therefore, your skills should be compatible enough to deal with the conditions.

Article Source >> http://www.aeisndt.com/blog/how-to-get-a-pipe-welder-certification



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So What Are Some of the Applications For the Gas Tungsten Arc Welding Process?

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Home Page > Home Improvement > Construction > So What Are Some of the Applications For the Gas Tungsten Arc Welding Process?

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So What Are Some of the Applications For the Gas Tungsten Arc Welding Process?

By: Jennifer Jenkins
Posted: Jan 04, 2011

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So what are some of the applications for GTAW?
Obviously, this process is used for a wide variety of applications where the parts are made out of non-ferrous metals. Maintenance and repair is done by both manual and automatic methods of Gas Tungsten Arc Welding. From stainless to titanium, aluminum, inconel, monel, cobalt, magnesium, hastalloy, you name it, and it can probobly be welded with TIG.

It is appropriate for welding of pipe and tubing in all positions. The excellent control of heat input gives maximum penetration while preventing melt-through on the root (first) pass. A lot of times a procedure is used where the root pass is welded with the GTAW process and then completed with Shielded Metal Arc Welding, Gas Metal Arc Welding, or flux Cored Arc Welding. This is used to obtain a high quality, low cost weld.

Consumable inserts are sometimes used in critical service applications. These inserts reduce porosity when alloyed with deoxidizers, improve the contour of the underside of the weld, and minimize cracking in the weld. On thin pipewall (depending on the base metal) , complete fusion is obtained without the use of filler metal. Filler metal , is used with thicker sections in order to fill the joint. Pulsed current may also be used.
Automatic circumferential or orbital Gas Tungsten Arc Welding is also used to weld pipe and tube.
Power piping, Air piping, Refrigeration piping, Chemical industry process piping, and Nuclear power piping are some of the different industries that apply the Gas Tungsten Arc Welding  process for welding pipe and tubing. Vacuum jacketed piping and pressure piping are a couple of cases where critical welding is required.

Nuclear Power Facilities :

Critical welding in the construction and repair of nuclear power facilities is required. Both manual and automatic methods are employed for many nuclear applications because of their precise control of the welding.
Pressure Vessels, Boilers, and Heat Exchangers :
Gas Tungsten Arc Welding has a wide range of applications in  the pipe and tube industry for the welding of pressure vessels, boilers, and heat exchangers. It is employed where full fusion welding is made from one side, without the use of permanent backing rings, and on girth butt welds with a smooth internal contour. Adequate mechanical strength and corrosion resistance for a particular service encountered can be obtained by choosing the correct filler metal and welding conditions.

Aerospace :

The Gas Tungsten Arc Welding process is the major welding process used in the aerospace industry. Aircraft, spacecraft, and launch vehicles are a few of what’s included in this industry. Some of the metals welded include aluminum, nickel, stainless steel, magnesium, and super alloys. Both the manual and automatic methods are employed in this industry. Pulsed current is also used extensively in this industry. Just about all critical welds made in this industry are done by TIG and a highly skilled welder.

Ships :

The Gas Tungsten Arc Welding process is applied in the ship-building industry because different materials like aluminum, molybdenum, and stainless steel are used. There is a lot of applications in this industry for the welding of stainless steel and aluminum.

Transportation :

The Gas Tungsten Arc Welding process is used somewhat in the automotive and railroad industries. It is used mainly for the welding of non-ferrous metals, maintenance, and for small components. Fabrication of aluminum fuel tanks is one application used in this industry.
In the railroad industry, several of the interior components are made of aluminum, stainless steel, monel, and copper are sometimes welded by this process. Some maintenance and repair of passenger trains is also performed.

Another area of use for this process is contractor work. If you have the equipment and skill you can charge anywhere from – 5 per hour. I personally know a person who’s company charges per hour for TIG aluminum jobs and he gets it. If you don’t have the equipment, you could always try to go to work for a contractor. TIG welding is a very rewarding profession, and they always need skilled welders.

So my advice to you is, if you want to be a TIG welder, get some training ( I recommend The Hobart Institute of Welding Technology in Troy, Ohio ) They’re the best! Maybe, if you could afford it,  get a certification in GTAW while you go to school there. Apply yourself, and learn as much as you can. Then be aggressive, and go out there and get a job in the TIG welding industry. Make sure to keep your attendance perfect, if at all possible. Employers want you to come to work and be on time. If you do this you’ll be on your way to an interesting and fun career that is rewarding.

Jennifer Jenkins

 

 

 

Jennifer Jenkins – About the Author:

Jennifer Jenkins is an expert in many niches. She would like to invite you to visit another one of her and husband Ralph’s many websites. If your interested in earning extra cash while working at home, then go to http://www.free9fastcashvideos.com and sign up to get your FREE membership and a totally FREE 9 video course on how to start an Internet Marketing business.

Source: http://www.articlesbase.com/construction-articles/so-what-are-some-of-the-applications-for-the-gas-tungsten-arc-welding-process-3967313.html

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Article Tags:
gas tungsten arc welding, gtaw, non ferrous metals, arc welding, welder, stainless steel, applications, pipe and tubing, nuclear power, filler metal

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Historical monuments, construction of building, bridges, ship building, automobile, aerospace, power plants, refineries and lots of manufacturing activities needs the process of welding and it is a part of it. Manufacturing activities need proper welding technology to meet the demands and welding system is the backbone of all manufacturing activities. It is a fabrication process that joins metals, materials and thermo plastics.  When you consider the history of welding, forge welding was the only processes introduced first and later on arc welding, oxy fuel welding and resistance welding were developed. 20th century started good for the welding process, it saw many new welding processes and welding technologies.

Mig welding, tig welding submerged arc welding and flux core welding were developed during 20th century and new welding equipment with latest welding technology were introduced later. The manufacturing industry came to know about the importance of welding services and requirement for welding supplies increased a lot. To cope up with the heavy requirement, welding industries started to use new welding tools, welding products, welding accessories and welding equipment supplies that are designed according to the latest welding technology. Welding techniques is classified into two methods based on the welding consumables such as consumable and non consumable electrode methods.

Shielded metal arc welding, gas metal arc welding, flux-cored arc welding and submerged arc welding are the welding techniques that come under the consumable electrode methods. Gas tungsten arc welding, plasma arc welding, atomic hydrogen welding, electro slag welding and stud arc welding comes under the category of non consumable electrode methods. Tig welding uses tungsten welding electrode and consumable techniques use welding electrode rod or stick for its process. Many industries use inverter welding machines and there are different welding machines for different welding techniques. Apart from the welding products such as mig, tig, stick and submerged arc welding products, the other products such as wire feeders, spot welders, multi process units and water coolers comes under the welding products.

Plasma cutter the new invention comes under the category of cutting products and apart from plasma cutting, plasma gouging is also done in the same welding machine. Different types of welder machines are available such as mig welder, tig welder, on board welder, reconditioned welder, aluminum welder, steel welder and metal welder are used for the process of welding. Welding fumes are dangerous, so the weldor should be protected with welding gears such as welding helmets, welding masks, welding gloves and with proper welding accessories. Welding guns and welding torches are important to weldor and the weldor should have proper control over it.

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The various types of alloys include non-heat-treatable alloys like the ones containing manganese (Mn) and Magnesium (Mg) and heat-treatable alloys containing magnesium zinc and silicon copper.

Work pieces made from these types of aluminum are easier to weld whereas the ones containing copper and lead are harder to work with. Copper and lead alloys usually have a tendency to crack when they are weld, which makes it harder to work with them.

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Safety, Precautions and First Aid

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Aluminum also requires special care because aluminum jobs produce imperfections in the weld area that have to be brushed away with a steel brush from time to time. You have to be careful while you use the brush.

It is also advisable to learn how to aluminum weld properly as well as know basic first aid in case you or any of your coworkers are injured while welding. Without adequate safety and precaution, your aluminum welding job is an endeavor fraught with risk. You must take steps outlined here to reduce that risk.

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A standard reference for decades, this new edition of Pipe Welding Procedures continues to reinforce the welder’s understanding of procedures. Drawing on his extensive practical and teaching experience in the field, the author describes in detail the manipulating procedures used to weld pipe joints. Readers will find useful information on heat input and distribution, essentials of shielded metal-arc technology, distortion, pipe welding defects, welding safety, essentials of welding metallurgy, and qualification of the welding procedure and the welder.

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Product Description
Provides complete coverage of the gas tungsten arc welding field. Theory, fundamentals, equipment, and safety are addressed as well as basic skill and proper procedures for a successful weld. An introduction to all of the major areas. Previous edition: c1996. DLC: Gas tungsten arc welding Handbooks, manuals, etc.

Gas Tungsten Arc Welding Handbook

Product Description
Welding Technology Fundamentals is written for secondary and postsecondary students, apprentices, journeymen, and individuals who wish to learn to weld. This book covers the equipment and techniques associated with the welding and cutting processes most widely used in industry today. These processes include: oxyfuel gas welding and cutting, shielded metal arc welding, gas metal arc welding, flux cored arc welding, gas tungsten arc welding, and resistance welding. Technical information regarding weld inspection and testing, welder qualification, drawing interpretation, and welding symbols is also included. The text is organized into eight sections, which can be studied independently or in sequence. Written in easy-to-understand format, this text is extensively illustrated and includes many tables and charts for selecting the variables required to make a good weld. Correlated with the QC-10 Standard.

Welding Technology Fundamentals

Hello,

TIG Welding is one of the 2 Most Used types of Welding.  Today we
look at it in depth.  We check out the process and pick up some tips.

TIG(GTAW) Welding Process Overview
The acronym TIG stands for Tungsten Inert Gas Arc Welding and the
acronym GTAW stands for Gas Tungsten Arc Welding this is the same
process but it is referred to by these two different names.

In the situation you will be welding using an electric arc that
generates the heat. You then have a tungsten non-consumable
electrode that then produces the weld you are attempting to make.

One of the things that have to happen in this type of welding is
that the particular metal that you are welding has to be shielded
from contamination in the atmosphere or you will get a poor weld.
Because of this, the area is shielded using an inert gas like
argon; this is used with a filler metal where necessary.

This type of welding needs constant current to flow across the arc
using an ionized gas called plasma. Plasma also has metal vapours
within it. You will usually use GTAW if you have to weld thin
metals like stainless steel, aluminium, magnesium or copper allows.
GTAW also gives the person who is operating the welding process
more control of the weld.

What this means to the weld is that it is a stronger weld and has a
higher quality than many other types of welding. Many experts say
that it is harder to learn, is complex and can be slower than other
welding techniques.

Some welders like using a different kind of torch to produce plasma
arc welding which is very much like this one but a little
different. This type of welding will give a more focused welding
arc, but usually this is done through automation.

How It Operates
The reason this welding process is the most complicated or
difficult to master is because the welder has to use a smaller arc
length; they have to be able to have a very steady hand. If they
aren’t able to keep a distance between the electrode and the piece
they are working on, the piece can become contaminated and there
can be problems with the weld.

This is also a two handed process because you have to be able to
hold the torch in one hand and feed a filler metal into the space
that you are welding. You can see that this is a very intricate
process and one that requires high skill.

There are a few types of welding that will not require this type of
weld and the individual will not have to use filler material these
types include: edge, corner and butt joints. These types of welds
are called autogenous or fusion welds (Source: Wikipedia).

A welder who is highly skilled in this process is able to alternate
between using the torch and then using the filler material in a
pretty fast way.  As they do this the filler rod can be taken out
as the electrode moves forward, and it doesn’t have to be taken out
of the gas shied. This is a highly developed process for those who
can do it well.

GTAW can operate using several different currents: positive direct
current, negative direct current or alternating current. This will
all depend on how they set up the power supply in the beginning.

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Product Description
Welding Skills provides comprehensive coverage of welding safety, the major welding and cutting processes with skill-building exercises, essential metallurgy, welding symbols, weld evaluation and testing, and much more. All content is clearly presented in a heavily illustrated format for easy comprehension. American Welding Society (AWS) terms and definitions are used throughout the textbook.

The fourth edition features an expanded chapter on welding safety, a new chapter, Dissimilar Metal Welding, and the integration of AWS SENSE recommended content where appropriate throughout the textbook. Each welding process module has been updated to include the latest equipment, simplified explanations of operating theory, and helpful charts to assist with electrode and shielding gas selection.

The new edition also features expanded coverage of the latest welding equipment, procedures, and materials and Gas Metal Arc Welding, Gas Tungsten Arc Welding, and Flux Cored Arc Welding.

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