Do you know the best approaches for welding stainless? That’s like asking whats the easiest method to go fishing? This will depend on several things, does not it? Many things like which kind of stainless, what thickness, whats the applying, as well as for what industry?
Lets concentrate on three industries:
Food service, Aerospace, and Nuclear.
1. Food Service
Most stainless within the food service market is 300 series stainless. Type 304 .063″ thick stainless sheet metal to become exact. If you want to any Junk food counter and look for all of the counters, shelving, cookers and the like, you will observe it’s all produced from welded stainless sheet metal. Food service codes require 304 stainless to be employed in preparing food areas because it doesn’t rust easily. All welds should be performed in a way not to trap bacteria along with other crud. Back sides of stainless welds ought to be shielded with argon so they aren’t sugared and filled with pits that may trap bacteria like salmonella. All wire brushing ought to be done with a stainless-steel brush and welds that aren’t perfectly smooth ought to be blended smooth with some form of abrasive wheel after which cleaned with alcohol.
Tig welding is nearly always the very 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.
Strategies for welding SS sheet metal : 1 amp per 1 a large number of thickness, keep your hot tip from the filler fishing rod shielded and snip it whether it will get oxidized, use chill bars made from aluminum, copper, or bronze whenever you can. Filler fishing rod should generally ‘t be larger than thickness of metal welded. Keep bead width close to 4 occasions the thickness from the sheet. Make use of a gas lens style cup, a #7 or bigger. SingleOr16 thoriated or lanthanated electrode will easily weld 16 ga .063″ sheet. Keep electrodes neat and sharp.
Stainless 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 typical, but so might be martensitic stainless grades like 410 steel , Greek Ascoloy, and Jethete M190. Another group of stainless utilized on commercial aircraft may be the Precipitation Hardening variety. A PH in the finish like 15-5ph, 17-4ph, 15-7ph, 17-7ph signifies the steel is precipitation hardening. Which means holding it at hot temperature for longer time enables the steel to harden. PH grades are occasionally a lot more hard to weld compared to straight 300 series due to alloy elements and sophisticated metallurgical reactions to heat while welding.
Tig Welding and automatic plasma welding would be the most generally 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 employ any way to prevent distortion (skip welding, fixturing, small beads) shield the rear side of all things you weld with argon using tooling, or homemade purge boxes.
Nuclear piping systems use lots of stainless and many from it is TIG welded. Or at best the main pass is tig welded. The majority of the stainless piping is fundamental 304L stainless but other grades like 316 are utilized also. Tig root passes with stick fill is fairly normal with heavy wall pipe but anything under schedule 80 is generally just Tig welded completely out because x ray answers are better this way. Stick welding is hard with stainless.
Instrumentation lines which are 1/2″ and fewer across and therefore are frequently completed with orbital tig welding since it is so repeatable. Welding small diameter tubing by hand is difficult.
You will find all sorts of other applications for welding corrosion resistant alloys like boat propellers, headers and exhaust, and marine hardware like sailboat parts. One factor to keep in mind is they distort easily so safeguards like heat sinks, chill blocks, and minimizing heat input are important strategies to use.
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