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Welding/Metalworking... Talk & Q&A Get your torch, braze, hammer, tig or mig on here!

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  #1  
Old 10-06-2016, 08:29 PM
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Default Dual Shield Welding

So for the last month or so I've been experimenting with dual shield welding. If you don't know what that is, it's where you use flux cored wire and a shielding gas. The reason being for the experimentation, I was at work one day and they were using our big 480v wire feed welder and the welds were looking like crap. Turns out, they have the polarity wrong but refuse to allow me to swap leads around. Anyway, I've been playing around with it for a month or so at home and I'll have to say, it's a very pretty weld when you're done. Almost looks like a 7018 stick weld but less time consuming because you don't have to swap electrodes and chip slag off constantly and less time consuming than MIG because you don't have the prep time. And if you're worried about splatter build up, spray your metal with PAM, yes the cooking spray, first.
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Old 10-07-2016, 07:53 AM
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I had the same results when I ran out of solid wire for the mig welder. I slapped a roll of inner sheild on it and ran it with the gas with good results.
Didn't help my shakey hands tho.
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Old 10-07-2016, 08:58 AM
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Only thing that helps shaky hands, and I know just what you mean, is resting your "guide" hand on a stable surface. Only downfall is if you hold your MIG gun as I do, you go through quite a few more left hand gloves. Forgot to mention yesterday that even overhead, which I absolutely hate doing, is easier with the flux cored and gas.
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Old 10-10-2016, 10:41 AM
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I was a truck equipment mechanic/welder/fabricator for many years. We always used flux core wire with straight CO2 shielding gas. It works good for heavy stuff because it burns hot as hell and also good at burning through paint/rust/dirt/etc. Not the prettiest but effective on that stuff. Don't try welding any thin stuff though - way too hot.
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Old 12-30-2017, 06:55 PM
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So as some of you may know, I went to another two week welding course for work right before christmas. Good class for me as we got more in depth on what happens during welding and getting into blue prints. Anyhow, again we were using .045” dual shield with 75%argon, 25%Co2. Covered vertical groove and fillet, horizontal groove an fillet, and overhead groove and fillet welds all on 3/4” plate. For the final project of the class we went into what’s called spray transfer(kinda) on 3/8” plate with a 1/2” opening and 1/4” backing strip. We cranked everything way up until the wire made a “V” instead of breaking off as it does in short circuit transfer, for my machine it was 29.5V and 525IPM wire speed. I swear it was one of the coolest(actually hot as hell) things I had ever seen. Unfortunately for the school I toasted the gun because in an 8” section running a gas cooled nozzle it got so hot that it melted the liner, o-rings, and nozzle insulator. Really makes me want to have a larger wire feed welder and a tig/stick setup. So for now, as my wire feed works for thin metal and short runs, I am going to invest in an a/c tig and stick machine.
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Old 12-31-2017, 09:48 PM
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Thanks for the update. Iv'e been welding for 35 years or more and still learning. Still trying to get the hang of pulse arc welding. I'm having a hard time with machine settings. Once I get it set right it welds great.
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Old 01-01-2018, 03:55 AM
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I’ve noticed with pulse arc, you have to set the machine up just right and move just fast enough. Pretty much turn up volts and wire speed until it’s a steady arc and run it like normal. I learn something new everytime I turn a welder on and pull the trigger. About to step foot into some uncharted territory for myself this coming year, decided that it’s time to buy a Tig welder and learn GTAW so I can weld aluminum. I had to turn down a lot of side jobs because I didn’t have that ability.
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1933 Chevy thread

http://ratrodsrule.com/forum/showthread.php?t=28825

1931 Chevy thread

http://ratrodsrule.com/forum/showthread.php?t=33579

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http://ratrodsrule.com/forum/showthread.php?t=36305
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Old 01-01-2018, 09:27 AM
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Thanks for the insight. I have an old Lincoln Idealarc that is set up for tig and I need to practice more. My problem is that I have a spool gun for miller 350P and it welds so well that I go to it first and don't get any practice with tig.
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Old 01-01-2018, 11:34 AM
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Been running flux core and 75/25 for years, but i prefer 7018 stick for small jobs.
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Old 01-01-2018, 05:02 PM
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I definitely agree with you 26T, 7018 is good for “small” jobs or areas that you just can not get a nozzle into. But like they say, different strokes for different folks which translates to different processes in the welding world.
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1933 Chevy thread

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1928 essex coupe

http://ratrodsrule.com/forum/showthread.php?t=36305
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