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TIG welding 8620 chain

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

If the grade is SAE 8620, then welding problems will likely occur frequently.  Have the links already been heat treated?  Quenched and tempered?  Carburized?  Either is a problem, with the latter a serious one.

RE: TIG welding 8620 chain

Most chain link welding that I have seen in the industry is done using the electric resistance process, not GTAW.

The chain industry has standards, you can Google this information.

RE: TIG welding 8620 chain

(OP)
Thanks for the quick responses!

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

(OP)
This just in:

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.

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