Komatsu video

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I was watching Komatsu builds on How It's Made.All mig welded as I could see. Tacked by man, finished by robot. Looked like single pass on some pretty heavy pieces. Whoa, wire spool size was something else. Couldn't fit that spool in my mig  Anyway, it seemed pretty smokey. Does anyone know if it's a dualshield process? Just to satisfy my curiosity.
Reply:Submerged arc welding is common on larger pieces like that.  Wire feed welding can run much higher currents than stick because the current doesn't have to be transmitted through the filler material which allows for fewer passes.
Reply:Hey Wally,I saw that one too.  I love that freakin' show!!!!  Based on the presence of both smoke and a nozzle on the mig gun that looked like it was designed for gas shielding, I would guess that it was a Dual Shield process, or something similar.  I did't look close enough to notice if there was an automated spattershield nozzle, so maybe they media blast and chemical clean before finishing.  Just a guess.  I didn't notice any submerged arc in the How it's Made episode, but there is a good chance that Komatsu uses it for long welds on plate and box parts, like boom arms, to make sure they control warping.I just wish that the show were on more.  That and Dogfights are my 2 cable faves right now!cricman
Reply:Agreed, no sign of submerged arc so probably dual-shield.Is How It's Made on DVD? I wouldn't mind them watching again. Excellent show. Much better than most of the TV drivel these days.Craftsman 230a Buzz-box,  Lincoln 140T & 180T, Century K2789, PUROX W202 O/A14" cheapo chop saw that cuts straight and square!A toolbox of the cheapest Chinese tools money can buy"Real" tools all old reliable Husky/Craftsman/Proto stuff
Reply:Originally Posted by wallythackerAgreed, no sign of submerged arc so probably dual-shield.Is How It's Made on DVD? I wouldn't mind them watching again. Excellent show. Much better than most of the TV drivel these days.