Michelsen Ayala posted an update 1 year ago
Which are the best processes for welding stainless? That’s like asking whats the simplest way to go fishing? It all depends on a many solutions, right? Lots of things like which kind of stainless, what thickness, whats the applying, and then for what industry?
1. Food Service. Most stainless-steel within the food service market 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 all the counters, shelving, cookers and so forth, you will see to make sure created from welded stainless-steel sheet metal. Food service codes require 304 metal to be utilized in food preparation areas since it doesn’t rust easily. All welds should be performed in such a way to never trap bacteria along with other crud. Back sides of metal welds must be shielded with argon in order that they usually are not sugared and full of pits which could trap bacteria like salmonella. All wire brushing ought to be done with a stainless-steel brush and welds which aren’t perfectly smooth must be blended smooth with some type of abrasive wheel and then cleaned with alcohol.
Tig welding is almost always the top process since spatter and slag are absent. Tig welding rods needs to be 308L for welding 304 stainless. L is good for low carbon because
Carbon is not good with regards to corrosion resistance in stainless.
Tricks for welding SS sheet metal : 1 amp per 1 a large number of thickness, keep your hot tip from the filler rod shielded and snip it whether or not this gets oxidized, use chill bars made from aluminum, copper, or bronze anytime you can. Filler rod should generally stop larger than thickness of metal welded. Keep bead width to a number exceeding Four times 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. Stainless alloys used in the aerospace and aviation industries can be a much more varied. There are various them. Austenitic stainless steels like 321, 347, 316, and 304 are routine, but so might be martensitic stainless grades like 410 steel , Greek Ascoloy, and Jethete M190. Another group of stainless used on commercial aircraft may 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 high temperature for longer time enables the steel to harden. PH grades are often much more difficult to weld than the straight 300 series as a result of alloy elements and complex metallurgical reactions to heat while welding.
Tig Welding and automated plasma welding would be the most often utilized processes.
Tips 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 the trunk side of everything you weld with argon using tooling, or hand made purge boxes.
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