Michelsen Ayala posted an update 7 months, 2 weeks ago
What are best approaches for welding stainless? That’s like asking whats the simplest way to go fishing? It depends over a many things, right? Lots of things like which stainless, what thickness, whats the application, and then for what industry?
1. Food Service. Most stainless within the food service marketplace is 300 series stainless. Type 304 .063" thick stainless sheet metal to be exact. In case you check out any Take out counter and check out every one of the counters, shelving, cookers and the like, you will learn it is all produced from welded stainless-steel sheet metal. Food service codes require 304 stainless-steel to be employed in preparing food areas since it doesn’t rust easily. All welds should be performed in such a way to never trap bacteria and other crud. Back sides of stainless welds ought to be shielded with argon so they usually are not sugared and brimming with pits that may trap bacteria like salmonella. All wire brushing ought to be done having a metal brush and welds which aren’t perfectly smooth ought to be blended smooth with some sort of abrasive wheel and then cleaned with alcohol.
Tig welding is nearly always the best process since spatter and slag are absent. Tig welding rods ought to be 308L for welding 304 stainless. L is for low carbon because
Carbon is bad with regards to corrosion resistance in stainless.
Tricks for welding SS sheet metal : 1 amp per 1 thousands of thickness, keep the hot tip from the filler rod shielded and snip it whether it gets oxidized, use chill bars created from aluminum, copper, or bronze whenever possible. Filler rod should generally not be bigger than thickness of metal welded. Keep bead width to around 4x the thickness from 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 and also sharp.
2. Aerospace. Stainless-steel alloys employed in the aerospace and aviation industries really are a much more varied. There are lots of them. Austenitic stainless steels like 321, 347, 316, and 304 are typical, but so are martensitic stainless grades like 410 steel , Greek Ascoloy, and Jethete M190. Another category of stainless used on commercial aircraft will be 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 temperature longer time permits the steel to harden. PH grades are sometimes much more tough to weld compared to straight 300 series due to alloy elements and complex metallurgical reactions to heat while welding.
Tig Welding and automated plasma welding include the mostly utilized processes.
Strategies 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 methods to prevent distortion (skip welding, fixturing, small beads) shield a corner side of everything you weld with argon using tooling, or home made purge boxes.
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