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Question for Steve with U.S. Alloys

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Steve

08-30-2000 20:14:03




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Steve can you or anybody help me with this one. I finally decided to go CO 2 on my mig welder. (Century 170GS) I bought it 8 months ago and been using flux wire. Got the hang of it using the flux core. Today I bought a 10LB. roll of .030 solid steel wire and wanted to pratice on a piece of 14 ga. sheet metal using CO2. I had a very hard time trying to get the speed and amperage right. I notice my regulator iced up on me. I cut the flow completely off and try to weld. It seemed to me I could get the speed and amps set, so I gradually opened the regulator back up and right away the buzzing would become aratic and I could see a little ballup on the wire. Could the freezing up cause moisture in the lines and regulator. What can I do to fix this? Thanks Steve

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Steve U.S. Alloys

08-31-2000 06:43:36




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 Re: Question for Steve with U.S. Alloys in reply to Steve, 08-30-2000 20:14:03  
Hi Steve,
The first thing I would say is what Jimmyz said. Did you set your polarity back to reverse? Also, make sure you stay within the proper parameters in regard to stick out and torch angle. The longer the arc, the higher the voltage will go. The wrong torch angle will not supply the proper amount of shielding gas needed to create heat and shielding. CO2 is a reactive gas and will produce more spatter and fumes than an argon mix. Penetration will be higher than an argon mix and the bead appearance will be rougher.

If you are using a gauge and not a flow meter, the gauge should be set at around 25PSIG to get in the ball park.

I am a bit confused when you say you got the speed and amperage set w/o a shielding gas. Did they give you a solid copper coated wire for certain? If you were able to weld w/o the gas on, I would suspect you may even have the wrong wire in this case.
Steve

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Steve

08-31-2000 20:15:22




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 Re: Re: Question for Steve with U.S. Alloys in reply to Steve U.S. Alloys, 08-31-2000 06:43:36  
I did change the polarity jumpers to DC neg.The wire I bought is ER70s-6 solid wire. I was also surprised that I got a steady arc with no gas but a poor bead. As I gradually opened the flow again the arc started to become aratic.You may be right Steve that I wasn't holding the gun at the proper angle. What angle is best to hold? I also called the welding shop and the man thier said that I might try changing the polarities back to straight since it was welding good before I changed them. I know the difference on polarities settings with a AC/DC stick welder put what is the difference with a wire welder? Is it basically the same? Thanks for everybody's help. Steve

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Steve U.S. Alloys

09-01-2000 05:43:13




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 Re: Re: Re: Question for Steve with U.S. Alloys in reply to Steve, 08-31-2000 20:15:22  
The polarity should be set to electrode positive. DCEP The proper angle is 15� to 25� tilt in direction of travel using backhand method. Use proper stick out from 1/4" to 3/8".



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JIMMYZZ

08-31-2000 00:13:24




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 Re: Question for Steve with U.S. Alloys in reply to Steve, 08-30-2000 20:14:03  
make sure to change polarity to reverse



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