The Process Of Stainless Steel Welding

By Sherry Gross


Stainless steel is a metal with chromium content of more than ten percent. Three metal classes have stainless steel; ferritic, Austenitic and martensitic. They are classified on the basis of their crystal structure. Autenistic grades have low carbon content.Below are steps used in connecting stainless steel welding.

Ensure Safety first. Take caution in protecting yourself and others. Fumes and gases affect health and electric shock kills. Read manufacturers instructions and provide articles on workers safety to your employees, protect your head from the fumes . Ensure ventilation and keep the exhaust at the arc, wear protective gears for the body, eyes and ears. Take caution not to touch live electrical wires.

Decide on which joint design you will use. This will ensures strength of welded steel. When connecting base metals, ensure strength, metal thickness, bonding position and how accessible the joints are. Joints are of five types; lap joint, edge joint, butt joint, cornet joint and t joint. They are arranged in different combinations to ensure a variety of welds. Make use of fixtures and jigs to secure pieces. When you are connecting, clamp metal sheet, joints and fillets when working.

Choose a welding process. For the stick electrode process, heat needed for welding is from the electric arc that is flanked by the metal at the base and the metal electrode. It is a cheaper process but it is inefficient because of the slang coating or stub loss. Tig welding process can be performed on various metals. Heat used in the welding process is generated at an electric arc between base meal and the tungsten electrode. Filler metal can be added if necessary. An inert gas shields the arc.

Mig welding is faster in metals with thin gauge and with heavy plate. Heat used in the process is produced in the arc in between base metal and the filler electrode. Mig welding process is done in two ways; short circuit transfer or the spray transfer. Use the short circuit transfer in small and thin gauges. For spray transfer, spraying of droplets of metal is done.

If your method of welding requires shielding, determine which gas to use. The Shield electrode does not require a shielding gas. For the tig process, shield with argon if the metal thickness is approximately half. Use argon helium mixture or just helium if the metal is thicker. Employ helium for deeper penetration. Two percent thiorated is used mostly. For mig welding, use between one percent and two percent argon or combined oxygen and argon. Mostly, one percent oxygen is used.

Next, select filler metal. If metal pieces are same, make use of a filler metal with the same composition as the base metals for uniform properties of the weld. Consider the mechanical characteristics, the possibility of cracking and the compatibility when you choose a filler metal having different applications of base metal.

Use either direct or alternating current when using the stick electrode method. Direct current takes one direction of flow in the circuit. It either uses straight polarity or reverse polarity. Its advantage is that it can work even in settings with low current. Use direct current having a straight polarity in Tig bonding.




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