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The use of Welding Stainless Steel

What are best techniques for welding stainless steel? That's like asking whats the ultimate way to go fishing? The treatment depends on a lot of things, don't you think? Lots of things like what sort of stainless, what thickness, whats the approval, as well as what industry?

1. Food Service. Most stainless steel from the food service marketplace is 300 series stainless. Type 304 .063" thick stainless sheet metal to be exact. In case you check out any Fast food counter and check out every one of the counters, shelving, cookers and the like, you will notice it's all made from welded metal sheet metal. Food service codes require 304 stainless steel to get used in cooking areas because it does not rust easily. All welds should be performed in such a way not to trap bacteria and other crud. Back sides of metal welds needs to be shielded with argon in order that they are not sugared and filled with pits that may trap bacteria like salmonella. All wire brushing ought to be done using a metal brush and welds that aren't perfectly smooth needs to be blended smooth with some type of abrasive wheel and after that cleaned with alcohol.

Tig welding is practically always the very best process since spatter and slag are absent. Tig welding rods must be 308L for welding 304 stainless. L is good for low carbon because



Carbon is bad in relation to corrosion resistance in stainless.

Tricks for welding SS sheet metal : 1 amp per 1 thousands of thickness, keep the hot tip of the filler rod shielded and snip it if it gets oxidized, use chill bars made from aluminum, copper, or bronze whenever possible. Filler rod should generally stop larger than thickness of metal welded. Keep bead width close to 4x the thickness of the sheet. Work with 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 clean and sharp.

2. Aerospace. Metal alloys utilized in the aerospace and aviation industries are a little more varied. There are numerous them. Austenitic stainless steels like 321, 347, 316, and 304 are common, but so may be martensitic stainless grades like 410 steel , Greek Ascoloy, and Jethete M190. Another family of stainless used on commercial aircraft is the Precipitation Hardening variety. A PH at the conclusion like 15-5ph, 17-4ph, 15-7ph, 17-7ph indicates that the steel is precipitation hardening. Which means holding it at hot temperature longer time allows the steel to harden. PH grades are sometimes far more difficult to weld as opposed to straight 300 series as a consequence of alloy elements and sophisticated metallurgical reactions to heat while welding.

Tig Welding and automated plasma welding would be the most commonly 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 employ any means to prevent distortion (skip welding, fixturing, small beads) shield a corner side of all things you weld with argon using tooling, or home made purge boxes.

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