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Thread: Welder Capacity at Lower End
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26th July 2015, 10:29 PM #16SENIOR MEMBER
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I recently changed from CO2 to 75/25 on my UniMIG 165, and I'm not convinced it's really improved its thin section performance. It will turn down pretty low - 14 volts from memory - but you just get a sputtering progression of cold lumps, at least with 0.8mm wire.
I find I need to wind the volts and speed up until it starts to weld properly, then manually pulse-weld - you open a keyhole each time, and have to pause until the red has gone from the material, but it makes for a reasonably flat, full-penetration weld. Kinda slow though.
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26th July 2015, 11:32 PM #17
I will have a go with gas tomorrow. When I tried it before I did not have 0.6mm tips for the 0.6mm wire which is what came with my first mig welder. I have some 0.6mm tips now. I was outside the shed but sheltered in a corner right in front of the shed and it was not windy.
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27th July 2015, 07:31 AM #18
Look up "welding tips n tricks" on YouTube, plenty can be learned from Jody
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27th July 2015, 08:38 PM #19
Maybe being outside does make a difference.
Here is the result of my attempts today.
2mm Comparison.jpg1mm Comparison.jpg
Front and rear shots showing voltage and wire feed speed. The left picture is 2mm steel. The right picture is 1mm steel. I just guessed at the CO2 flow rate. The regulator I have to fit the disposable cylinder is very basic. Both the cylinder and the regulator were covered in frost. I did increase the flow rate part way thru as I felt it needed more.
Dean
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27th July 2015, 08:49 PM #20SENIOR MEMBER
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27th July 2015, 10:23 PM #21
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28th July 2015, 01:12 AM #22GOLD MEMBER
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If you are getting frost on your regulator then that means one of two things. Either you are doing a lot of welding, (unlikely with a disposable cylinder) or your flow is way too high.
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28th July 2015, 01:17 AM #23GOLD MEMBER
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I know I am probably in swimming against the tide with this view, but I am yet to find a single redeeming quality for argon mix on steel unless you are spray arcing. I hate the damn stuff - porosity in a cylinder and the spatter sticks like you know what to a blanket. If ever I am crowned King, I think I will make the use of argon mix on steel a capital offence )
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28th July 2015, 01:47 PM #24
It is a tiny regulator and uses 3mm poly pipe to connect to the welder. Having said that I have no idea what the flow rate was. This tiny regulator has no gauges. I am just trying to decide where to go next. It seems my welder is capable of welding thinner sections despite the welder specs implying otherwise. Next step would be to buy a gas cylinder then? What gas to get?
So straight Argon is the way then? This could then be used for both Mig and Tig welding? I do not want to buy 2 cylinders if I can avoid it. The price I have (Speedgas) is $529 for an E size cylinder pand $159 for subsequent refills. Does anyone know of any better deals. As I have said Speedgas from Gasweld is 90km away, but I can give the excuse of visiting the Grandkids and any shopping that needs doing there. A Power 10 store is located 140km away, similar shopping options, but no grandkids and we rarely go there. Depends on overall cost. Then there is having the cylinder shipped from afar. Anyone done this.
With regards to the picture of welding samples on 2mm steel and recognising that these are just quick inexperienced runs, I think that the 2 welds using 20.5v and 21.0v appear to be around the sweet(?) spot. Am I near the mark on this?
Dean
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28th July 2015, 03:13 PM #25SENIOR MEMBER
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Nope, if you're using a single gas, it has to be CO2.
I had been using a beer gas cylinder, which I still have, but decided to try a 75/25 mix from Gasweld. Being not that taken with 75/25 compared with straight CO2, my plan now is to use up this cylinder and swap it for one with argon (which I assume you can do - they're the same price to swap) and have a go at TIG on steel and aluminium.
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28th July 2015, 08:09 PM #26
Strange that because I did a quick search before typing that post and found
What type of gas is used for MIG welding steel?
- Shielding gases for MIG welding. The basic gas for MIG welding is inert – argon (Ar) or helium (He), or a mixture of both. However, small additions of oxygen (O2) or carbon dioxide (CO2) can further stabilize the arc, improve the fluidity and also improve the quality of the weld deposit.
Shielding gases for MIG welding - Sandvik Materials Tech
I bought a disposable Argon Cylinder today to play around with compare with the CO2 and found the CO2 was empty. Sigh.
Dean
- Shielding gases for MIG welding. The basic gas for MIG welding is inert – argon (Ar) or helium (He), or a mixture of both. However, small additions of oxygen (O2) or carbon dioxide (CO2) can further stabilize the arc, improve the fluidity and also improve the quality of the weld deposit.
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28th July 2015, 08:20 PM #27SENIOR MEMBER
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Do a Google for mig argon - you'll see a bunch of info about it. In short, pure argon will work, but it won't penetrate well, and might not be pleasant to weld with.
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29th July 2015, 11:28 PM #28Senior Member
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30th July 2015, 07:07 PM #29
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