TIG welding 8620 chain
TIG welding 8620 chain
(OP)
We have acquired a process that uses a dedicated TIG welding unit to butt(?)-weld 8620 steel chain links. We are experiencing early failure. Can anyone here school me on what a capable process for making good connecting links would look like?





RE: TIG welding 8620 chain
RE: TIG welding 8620 chain
The chain industry has standards, you can Google this information.
RE: TIG welding 8620 chain
This was my fear: that TIG was a bad call made by the folks from whom we bought this process. I know exactly jack about welding, I usually leave welding-spec calls to my fabricators, but in this case it's an in-house process that creates custom chain assemblies by linking several shorter 'stock' units.
I'll need to do some more digging to answer TVP's ???s.
-andy
RE: TIG welding 8620 chain
The links are purchased as cold-rolled wire bent into a 'C' shape, mechanically closed and manually TIG welded with filler-metal as recommended by the welding outfitter. They are getting 'porosity,' and failures at the proof-load. The chain (which determines the proof load: ~25,000 lbs iirc) is high-grade 1/2" chain of standard dimension, the links are of 5/8" diameter wire.
RE: TIG welding 8620 chain
Here is a site that 2 types, a Lok-A Loy and a missing link type, in two different grades.
http://www.slingchoker.com/sling2/crosby/chain.htm