M305 untising question

ColKurtz

ColKurtz

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M305, chro-moly of course,

I'm about to prep the spots to be tack welded as per the instructions in the stickies. In the process of getting a professional welder lined up.

AFTER the welds are done, should I apply cold blue or something else?
 
Does it stick out like a sore thumb though? I really want to maintain the cheap chro-moly look uniformly. I know very little about this, just what I've been able to dig up here and elsewhere online. Nobody talks about what it looks like AFTER the unitizing is complete. Or am I missing something entirely?
 
I often touch up the blobs or filet weld with a Qtip and cold blue just to make myself feel better. I guess I should have mentioned that in my FAQ posts from 2005 or is it 2004? It's been a long ride to 2015.

There, does that help?

Cheers, Barney
 
How about tell your welder ahead of time what material he is welding and he can go out and get the appropriate filler rod and shield gas.
Word from the wise:
Norinco stuff is chromoly steel, use a chromoly filler rod and reblue as usual after cooling
USGI and some aftermarket stuff is 400 series stainless.... Stainless filler rod is used.
Jiffy marker works better than anything else. Or get the cylinder armacoated or cerakoted.
ALWAYS wrap the cylinder in leathers immediately after welding to allow for a slower cool down.
We have unitised hundreds gas cylinders over the past decade in TonyTig's shop. These guys are the best in canada.
 
Ok thanks a lot everyone for the advice!

The welder I'm trying to get to do the job for me said "70s-2 hardwire filler or even a stailess filler such as 316L which has the ability to absorb the surrounding carbon that is in the chromoly, a little less strenght but much more ductile. "
 
Personally, I would say 45ACPKING has done a bajillion of these, and he gave you the type of rod/filler they've used. I don't know enough about welding to tell a welder what to do, but isn't it kind of odd using stainless rod on a chromoly steel? maybe not... dunno

just food for thought, and worth whatcha paid for it (or less)
 
The right stainless rod actually gives the best looking and strongest weld on the chromly because of it's ability to absorb certain properties in the chromoly steel alloy. But.... Then the bluing solutions don't/won't work.
Sounds like OP is in good hands with the welder he has lined up.
 
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