Spot Welding Stainless Steel Sheet

Jeff explains spot welding and gives a short demo welding stainless steel sheet.

Spot welding stainless steel sheet.

Key words resistance spot welding stainless steel dissimilar metal welding optimization failure analysis mechanical properties microstructure. For mig welding stainless steel a shielding gas mixture that s 90 percent helium 7 5 percent argon and 2 5 percent carbon dioxide is generally ideal. To most manufacturers spot welding is the most economical way to join two pieces of sheet metal. Accidental contact of elec trode to metal objects can cause sparks explosion overheating or fire.

Weld time and or weld power need to be increased to spot weld galvanized steel. The sheets are placed between the two welding electrodes to which pressure is applied. Resistance spot welding is widely used in sheet metal fabrication as an important metal joining process. Recently i had a job that required spot welding.

The balance between the cr and ni mn is normally adjusted to provide a microstructure of 90 100. Spot welding can cause fire or explosion. While joining sheet metal is the most common use for the process resistance welding rw equipment actually can be used for a large variety of joining and heat treating projects some of which are not so well known. When mig welding galvanized steel the weld puddle is 2550 degrees f.

To weld sheet metal with solid wires use electrode positive ep or reverse polarity. Darkmoon metals is a home based business start up i have dec. Passing an electric current through the welding electrodes and the sheets of metal results in a high degree of resistance in the sheets of. When welding 304 stainless steel er308 er308l and er308lsi wires are compatible but for welding 316l stainless you need a 316l wire.

Welding of steel is done at 2550 degrees f. With these materials use a tri mix gas 90 helium 8 argon and 2 co 2. There are some goo. 3 3 austenitic stainless steel the austenitic stainless steels contain 16 26 cr 8 24 ni mn up to 0 40 c and small amounts of a few other elements such as mo ti nb cb and ta.

Spot welding is a popular way of joining two sheets of thin metal such as stainless steel. Post weld heat treatment to soften and toughen the weld. The flying sparks hot workpiece and hot equipment can cause fires and burns. It should be obvious even to the causal observer that if you put 2550 degree liquid steel over a galvanized coating that boils at 1350 degrees f.

For most jobs welding stainless steel you ll want to use 030 inch diameter stainless steel welding wire. It has got lot of applications in the field of automobile industries. I seldom use my spot welder but for certain situations it is the right tool for the job.