Aug/090
How To Weld
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Every type of metal or alloy has different characteristics and requires the correct procedures on how to weld them. Metals can be separated into two categories, being non ferrous and ferrous. Non ferrous metals are the alloys such as aluminum, where as ferrous metals contain various amounts of iron. These include stainless steel, cast iron and mild steel. Each metal type requires different welding procedures and filler metals. These proceedures can be broken down into several different categories being, mig welding, arc welding, tig welding and gas welding.
Mig Welding is generally the most used method for industry and home use along side electric Arc welding. Learning how to weld using these methods is mostly for the welding of mild steel. Tig welding is a more specialized process and requires more in depth training. In order to learn to weld using a Tig welder a higher skill level is needed to master the art.
Gas welding is not used as much for the welding of mild steel however is still widely practiced in certain industries as refrigeration and plumbing, for welding copper pipework.
The basic process for how to weld requires that the metal parts to be welded are heated by means of an electric arc or heat from a gas welding torch. Once the metal is heated to melting point the two parts to be welded are then fused together with r without the aid of a filler material. With mig welding and arc welding the filler material is part of the welding electrode. For gas and tig welding the filler metal is hand fed to the weld as the metals are being heated by the gas heat or as in tig welding, by a tungsten electrode.
how to weld
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Aug/090
How To Weld Aluminum
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Tig welding aluminum is regarded more as a finishing weld where minimum clean up is desired and a showroom finish is the result. Tig welding should not be considered a weaker weld than with a mig as the fusion obtained is in effect superior to mig welding aluminum.
Basically tig welding aluminum requires more skill than mig welding as it’s a two handed operation. Tig welds are suited to lighter gauge metal and is used in the manufacture of items such as bicycle frames and food preparation equipment. Mig welding aluminum requires less finesse however and is more suited to large scale manufacturing and maintenance.
Learning how to weld aluminum is still a challenge even for experienced welders. Factors such as a lower melting point than normal metals, an oxide coating present on milled aluminum and its high thermal conductivity all lead to welding problems unless you have the knowledge to set up equipment and prepare for welding aluminum.
Errors in how to weld aluminum can be reduced by proper tuition in the way of setting up equipment for specific joints to be welded. This includes choice of aluminum shielding gas, selecting the correct current options for the welder and the right wire feeds for mig. Also preparation of the work to be welded and using the correct technique for the job.
Aug/090
How To Mig Weld
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In conjunction with the wire feed system, mig welders also require a shielding gas to protect the weld area from oxygen contamination. Also available is a 'gasless' wire for welding mild steel only, while the weld finish is not as good as using shielding gas, gasless wire is excellent for outdoor situations where weather and location make conventional mig welding difficult.
One of the basics one needs to master when learning how to mig weld is the setting up process of the welder itself. Different thicknesses of metal and the type of metal require different power settings. For example a mig machine set up to weld 1/4 inch plate would simply not handle welding 2 inch plate. A welding machines power is graded by amperage, so the higher the amperage of the welder the heavier the metal you are able to weld. To weld 1 inch thick steel and upwards would require a welder of in excess of 400 amps.
To operate the mig welder the work to be welded needs to have the earth clamp from the welder attached to the work-peice. Once the appropriate power settings are in place the operator pulls the trigger on the welding gun to activate the wire feed and the welder’s power. The resulting heat and injection of metal filler to the metal initiates the weld process.
Aug/091
How To Tig Weld
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Tig welding uses a welding torch with a tungsten electrode and shielding gas. The electrode is struck on the workpeice to create a short arc that in turn creates the fusion required. As a filler rod is also used the welder needs to use two hands, one for the Tig Welding Torch and one hand to feed in filler metal as required.
Tig welding is more likely to be used in industrial situations and is most common in the welding of stainless steel; however it can be applied to welding most all metals including aluminium. Tig welds are pure in respect to having no slag and minimum cleanup is required, allowing a quality finish both visually and in strength.
Depending on the skill of the welder and material being used, tig welds can be used in all position work and is suited to pipe welding where weld quality is essential. However for those interested in learning how to tig weld the best starting position is down hand or flat.
Aug/090
How To Weld Stainless Steel
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learning how to weld stainless steel is somewhat easier than welding aluminum and can be achieved by using any of three types of welding processes. Arc welding, Mig welding and tig welding.
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Arc welding stainless steel is achievable by using stainless steel electrodes. The procedure is really no different to that of welding mild steel. Setting up the appropriate amperage to weld stainless steel is usually printed on the pack that the electrodes arrive in. One thing you need to be cautious of is that as stainless welds cool using arc welding they tend to "ping' of the slag covering, sending eye threatening projectiles in any direction.
Mig welding stainless steel. This can be little more sophisticated as there are three choices of mig welding depending on the equipment available, spray-arc, short-circuiting, or pulsed-arc transfer. While these methods are used in manufacturing industries, for the layman a simple wire feed mig welder, stainless steel wire and by using argon-CO2 gas, is all that is required.
How to weld stainless steel depends much upon both the welding situation and the grade of stainless steel. There are two common grades of stainless steel, being 304 and 316 grades. For marine applications and high corrosion areas 316 is the preffered grade here, also 316 is used wideley in the manufacture of industrial equipment where chemicals are used . Type 316 is also used surgically for implants to the body.
Welding 316 stainless steel in these applications therefore requires the use a pure welding method and using the tig welding technique. Tig welding ensures very little contamination and allows small and intricate welds if needed.
Weling Stainless Steel