What are the best approaches for welding stainless? That's like asking whats the simplest way to go fishing? The treatment depends on the many solutions, don't you think? Lots of things like what type of stainless, what thickness, whats the application form, and then for what industry?
1. Food Service. Most stainless-steel in the food service market is 300 series stainless. Type 304 .063" thick stainless sheet metal to get exact. If you go to any Junk food counter and check out each of the counters, shelving, cookers etc, you will notice it is all made out of welded metal sheet metal. Food service codes require 304 stainless to be employed in cooking food areas as it won't rust easily. All welds should be performed such not to trap bacteria along with other crud. Back sides of stainless-steel welds ought to be shielded with argon so they usually are not sugared and filled with pits that may trap bacteria like salmonella. All wire brushing carried out which has a stainless brush and welds that aren't perfectly smooth should be blended smooth with many form of abrasive wheel then cleaned with alcohol.
Tig welding is almost always the best process since spatter and slag are absent. Tig welding rods ought to be 308L for welding 304 stainless. L is perfect for low carbon because
Carbon isn't good with regards to corrosion resistance in stainless.
Tricks for welding SS sheet metal : 1 amp per 1 thousands of thickness, maintain the hot tip in the filler rod shielded and snip it if it gets oxidized, use chill bars made of aluminum, copper, or bronze whenever possible. Filler rod should generally not bigger than thickness of metal welded. Keep bead width to Four times the thickness with the sheet. Use a gas lens style cup, a #7 or bigger. A 1/16 thoriated or lanthanated electrode will easily weld 16 ga .063" sheet. Keep electrodes as well as sharp.
2. Aerospace. Stainless-steel alloys employed in the aerospace and aviation industries certainly are a little more varied. There are several them. Austenitic stainless steels like 321, 347, 316, and 304 are routine, but so may be martensitic stainless grades like 410 steel , Greek Ascoloy, and Jethete M190. Another class of stainless applied to commercial aircraft is the Precipitation Hardening variety. A PH at the end like 15-5ph, 17-4ph, 15-7ph, 17-7ph indicates that the steel is precipitation hardening. This means holding it at warm for longer time allows the steel to harden. PH grades are now and again a lot more difficult to weld compared to the straight 300 series as a result of alloy elements and complicated metallurgical reactions to heat while welding.
Tig Welding and automatic plasma welding are the normally utilized processes.
Methods for Aerospace tig welding SS : Clean, Clean, Clean. Use as big a tig cup and possible 3/4 " --1". Use minimal heat and rehearse any way to prevent distortion (skip welding, fixturing, small beads) shield the back side of all things you weld with argon using tooling, or homemade purge boxes.
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