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Author Topic: Square wave TIGgin' and conventional differences  (Read 10436 times)

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borris

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Square wave TIGgin' and conventional differences
« on: September 23, 2008, 07:23:03 PM »
Tell us your experiences with both or either.Is the Sq.Wave stuff that much better on aluminum? Does it make it easier to do quality welds on aluminum? Is there any advantage to them on ferrous metals?
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borris

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Re: Square wave TIGgin' and conventional differences
« Reply #1 on: October 01, 2008, 09:14:03 PM »
I can't believe that the welders here don't have an opinion.
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phelpsracing1

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Re: Square wave TIGgin' and conventional differences
« Reply #2 on: November 04, 2008, 09:44:48 PM »
Hey. I use the Miller Syncrowave 350 with the high frequency start.  It welds pretty nice on aluminum.  You can adjust your arc balance, arc frequency, pulse controls, etc.... I work for the Dept of Defense on a military base where we rebuild and refurbish battle damaged HUMMWVs. The bodies are made 6061 T6 Aluminum at .090" thick.  We have to TIG all damaged areas (bullet holes, cracks, splits) and that is the machine we use
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Offline Reidy02

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Re: Square wave TIGgin' and conventional differences
« Reply #3 on: March 18, 2009, 06:57:23 AM »
I've heard that using say a TIG on something like a bike gas tank that the material actually gets brittle and that you're better off using oxy and I forget the gas now but it's suppose to be more malleable..
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Offline Boostinjdm

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Re: Square wave TIGgin' and conventional differences
« Reply #4 on: March 18, 2009, 07:12:24 AM »
I wonder if that's why Aaen performance gas welds their pipes.
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Offline fastcorvairs

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Re: Square wave TIGgin' and conventional differences
« Reply #5 on: March 18, 2009, 07:28:18 AM »
Linclon square wave Tig-355

You can set the preflow, after flow, on the gas.  Has T-spot can set pulses per sec. Background current.  AC wave balance. This is a stick and tig machine. 

When I was rebuilding a lot of VW and Corvair heads it was the only machine that would penetrate deep enough with out pre heat to get the cracks out.  This thing really gets down and cleans the weld out. only gas to use is 75/25. 75% Argon 25% Helium. 
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Offline fabr

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Re: Square wave TIGgin' and conventional differences
« Reply #6 on: March 18, 2009, 08:54:52 AM »
For deep welds I agree on the mix or even pure helium if needed for really thick material. For thin sections I like pure argon.Helium transfers heat better than argon and hence deeper penetration is possible at the same amps.
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Offline Reidy02

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Re: Square wave TIGgin' and conventional differences
« Reply #7 on: March 19, 2009, 06:39:27 AM »
If you were welding say a gearbox case, cast aluminum, it would be a good idea to pre-heat it wouldn't it? To stop it cracking..
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Offline fabr

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Re: Square wave TIGgin' and conventional differences
« Reply #8 on: March 19, 2009, 06:54:38 AM »
Yes.I've done alum head repair for many years. Some heads need re heat treated after welding also.AFR comes to mind there.
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"There can be no divided allegiance here.  Any man who says he is an American,
but something else also, isn't an American at all.  We have room for but one
flag, the American flag... We have room for but one language here, and that is
the English language... and we have room for but one sole loyalty and that is a
loyalty to the American people."
Theodore Roosevelt 1907

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Offline fastcorvairs

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Re: Square wave TIGgin' and conventional differences
« Reply #9 on: March 19, 2009, 06:58:10 AM »
Quote from: Reidy02 on March 19, 2009, 06:39:27 AM
If you were welding say a gearbox case, cast aluminum, it would be a good idea to pre-heat it wouldn't it? To stop it cracking..

Reidy

          Preheat is good.  The faster the heat is drawn from the weld the more likely the material is to crack around the weld.  Preheating the material will keep the heat around the weld zone longer.  enabling lower amperage to weld with.  Also if the argon is taken away from the weld zone to quickly that will cause cracks.  That's where being able to adjust the after flow on the argon comes in nice. 
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Offline fabr

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Re: Square wave TIGgin' and conventional differences
« Reply #10 on: March 19, 2009, 07:38:53 AM »
Good points.
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"There can be no divided allegiance here.  Any man who says he is an American,
but something else also, isn't an American at all.  We have room for but one
flag, the American flag... We have room for but one language here, and that is
the English language... and we have room for but one sole loyalty and that is a
loyalty to the American people."
Theodore Roosevelt 1907

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Offline Reidy02

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Re: Square wave TIGgin' and conventional differences
« Reply #11 on: March 20, 2009, 05:24:39 AM »
Thanks fellas, I was doing the right thing then well I guess I did cause he hasn't bought it back. ;D
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Offline Reidy02

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Re: Square wave TIGgin' and conventional differences
« Reply #12 on: March 31, 2009, 01:32:07 AM »
Also I would appreciate some advice, when welding Aluminum I find it hard to get a nice tidy bead and it's pissing me off someone help please!!
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Offline Boostinjdm

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Re: Square wave TIGgin' and conventional differences
« Reply #13 on: March 31, 2009, 01:59:19 AM »
pics?  specific problems?
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Offline fabr

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Re: Square wave TIGgin' and conventional differences
« Reply #14 on: March 31, 2009, 05:58:02 AM »
More heat sooner in the weld. Yeah,post the pix but from my own experience most alum weld problems stem from a guy(me) that has only tigged steel and doesn't realize how much more heat is needed at the start of an alum bead compared to steel of the same thickness and how much you will taper off the heat as the weld progresses.
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"There can be no divided allegiance here.  Any man who says he is an American,
but something else also, isn't an American at all.  We have room for but one
flag, the American flag... We have room for but one language here, and that is
the English language... and we have room for but one sole loyalty and that is a
loyalty to the American people."
Theodore Roosevelt 1907

-----------------------------------------------------------
 " You have all the right in the world to believe any damn thing you'd like, but you don't have the right to demand that I agree with your fantasy"
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