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27th November 2017, 11:01 PM
#91
Legendary
Originally Posted by
billyj
dom in all honesty your 130 amp mig is going to struggle on anything over about 3mm,
Yeah mate, and that's all I need atm. I would and can use the stick and TIG for thicker metal.
All the metal tubing that I've been welding so far have been well under 3mm.
Only reason I haven't got any work done from the 130amp gas MIG is 'cos I couldn't get it to
work with pure argon, and that 'cos I have to be tightarse with spending another $300 on MIG gas.
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27th November 2017 11:01 PM
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28th November 2017, 07:22 PM
#92
Expert
Originally Posted by
dom14
Yeah mate, and that's all I need atm. I would and can use the stick and TIG for thicker metal.
All the metal tubing that I've been welding so far have been well under 3mm.
Only reason I haven't got any work done from the 130amp gas MIG is 'cos I couldn't get it to
work with pure argon, and that 'cos I have to be tightarse with spending another $300 on MIG gas.
my point is that even down to 1.6mm steel you will be able to stick weld it if you get a bit of practice and use decent rods that freeze up fast, not just cheap nasty gp rods from bunnings
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28th November 2017, 07:22 PM
#93
Patrol God
Just watched your mid without gas video.
Turn the wire down. A lot. Like half what your on now so 2 to 3 maybe..
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29th November 2017, 04:36 AM
#94
Legendary
Originally Posted by
bigguwesty
Just watched your mid without gas video.
Turn the wire down. A lot. Like half what your on now so 2 to 3 maybe..
Pretty interesting, isn't it? Those ugly looking solid wire 'welds' without gas actually welded to the base metal fairly strong. It kinda works as long as I don't move the MIG torch & only hold it in one spot. So, it's kinda possible to do kinda strong weld tacks without gas with solid wire.
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29th November 2017, 04:39 AM
#95
Legendary
Originally Posted by
billyj
my point is that even down to 1.6mm steel you will be able to stick weld it if you get a bit of practice and use decent rods that freeze up fast, not just cheap nasty gp rods from bunnings
Yeah mate, I've been stick welding 1mm and even below thickness pipes with stick welding, but it's time consuming as the hammering & scraping take up a fair bit of time. Also, it demands I wire brush the paint or gal off the pipes first, 'cos it easier to burn a hole through it when the paint or gal get in the way of controlling the heat. And I did with cheap sticks as well. Doesn't look good, but appears to be holding two pipes together.
Last edited by dom14; 29th November 2017 at 12:30 PM.
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29th November 2017, 05:48 AM
#96
Patrol God
Originally Posted by
dom14
Pretty interesting, isn't it? Those ugly looking solid wire 'welds' without gas actually welded to the base metal fairly strong. It kinda works as long as I don't move the MIG torch & only hold it in one spot. So, it's kinda possible to do kinda strong weld tacks without gas with solid wire.
Not really. It may look ok from the outside but if you have to cut it open it would look like an aero bar on the inside
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29th November 2017, 12:31 PM
#97
Legendary
Originally Posted by
bigguwesty
Not really. It may look ok from the outside but if you have to cut it open it would look like an aero bar on the inside
Ok, cool. I guess you meant there will be hollowness to that weld tack and it is soft and weaker?
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29th November 2017, 12:33 PM
#98
Patrol God
Originally Posted by
dom14
Ok, cool. I guess you meant there will be hollowness to that weld tack and it is soft and weaker?
Yep. It'll be no good
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29th November 2017, 06:21 PM
#99
Expert
Originally Posted by
dom14
Yeah mate, I've been stick welding 1mm and even below thickness pipes with stick welding, but it's time consuming as the hammering & scraping take up a fair bit of time. Also, it demands I wire brush the paint or gal off the pipes first, 'cos it easier to burn a hole through it when the paint or gal get in the way of controlling the heat. And I did with cheap sticks as well. Doesn't look good, but appears to be holding two pipes together.
doesnt matter what welding process you use you should be grinding off any paint,gal,rust or scale first regardless. and a wire brush will not remove gal or scale just polishes it
without clean steel your just shooting yourself in the foot before you start
Last edited by billyj; 29th November 2017 at 06:38 PM.
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29th November 2017, 11:16 PM
#100
Legendary
Originally Posted by
billyj
doesnt matter what welding process you use you should be grinding off any paint,gal,rust or scale first regardless. and a wire brush will not remove gal or scale just polishes it
without clean steel your just shooting yourself in the foot before you start
Ok, cool. I was using a heavy duty wire brush with an angle grinder. I thought it was removing gal with some elbow grease on it, but i reckon you're right. It can't be that easy, 'cos if the gal removes that easy, then that would defeat the purpose, wouldn't it?
Grinding it will be from now on, but that means PITA extra and careful grinding work for me.
I tried using gasless MIG today(with 0.9mm gasless wire and low setting with number 3 wire speed) on under 1mm thick mild steel pipes.
It was way too easy to blow a hole through it. So much so, I would've had better outcome with stick welder with low amp.
But, kept persevering to get it right. It is apparently more difficult to weld thin sheet metal with a gasless MIG than with a gas one,
and particularly my Ozito one, which I think 'cos of the lack of amp/volt control(Only low and high settings). Nothing in between.
The rest has to be controlled with wire speed & heat management/hand control.
Last edited by dom14; 30th November 2017 at 01:39 PM.
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