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Tool Talk Discussion Forum

Mig Setup

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JOHN

02-20-2004 17:54:50




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I have the MillerMatic135 and I use the Trimix gas to weld 1/16 304 stainless.I would like to hear the frying sound.Which do I start with first,wire speed or voltage.It says gas pressure 20-30,voltage6 and wire speed 45.I use 308 wire .030.Penatration is good but it does not seem correct to me.I have read that alot of people have this problem.I tig welded for the first time last month and I find that to be going better then the mig.I can get the sound with stick.Hope you can give me some pointers on mig setup.Thank You in advance for the help,John.

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Byron

02-23-2004 22:10:15




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 Re: Mig Setup in reply to JOHN, 02-20-2004 17:54:50  
John, here are a couple of web sights that have a lot of info on them.

www.hobartwelder.com (go to the tool talk at top of page.)

www.weldingweb.com



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T_Bone

02-22-2004 10:12:00




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 Re: Mig Setup in reply to JOHN, 02-20-2004 17:54:50  
Hi John,

Here is a couple links to some welding threads that will help.

Link

Link

See if these two will help, if not post back and I'll reply.

T_Bone



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Bill 52 8n

02-21-2004 00:12:35




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 Re: Mig Setup in reply to JOHN, 02-20-2004 17:54:50  
What kind of transfer are you using? Is it a spray transfer, globular, short circuit? A spray transfer is when the wire comes to a point (literally) and then "sprays" into a cone shape on its way to the base metal. This type of mig welding is silent, or a hissing sound is heard if you don't have earplugs. Globular or short circuit is normally associated with the bacon frying sound. Any of these types of welding is acceptable on stainless as long as the weld looks good. The finished weld will optimally be a salmon or gold color. Any Blackening of the weld, usually on the back is a bad thing, it is a sign of carbide precipitates which will make the heat affected zone rust. As far as adjusting your welder, I think your voltage has notches that are used to set it, and your wire speed is infinte, i.e. no notches. I would adjust the wire speed first to see if that makes a difference, if not adjust the voltage.

Bill

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Wayne

02-20-2004 23:18:56




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 Re: Mig Setup in reply to JOHN, 02-20-2004 17:54:50  
Hey John, as long as your getting no excessive spatter, and making a quality looking weld that has good penetration don't worry about how it sounds when your putting it down. I've done alot of MIG on regular 'steel', as well as little bit of MIG on stainless and aluminium, and all three "sounded different" when I welded them. I don't know why, I guess I just never really thought that much about it as long as I got a good quality weld. I know with regular steel you can play with the voltage, gas, wire size, etc and get different results depending on what your doing. We run a 98%Argon 2% Oxygen mix rather than the normal 75% argon 25% CO2 mix which causes the arc to be a good bit hotter. This let us get a little bit hotter for a given voltage setting as well as letting us get the arc into a spray transfer which makes a nice, smooth, deep penetrating bead, with very little to no spatter, not to mention allowing us to increase the IPM of weld a good bit. I don't know if you can play with the gases as much with stainless, but if your simply not happy with what your doing now it may be a good place to start. Hope this helps some....Maybe T-bone will see this and have some ideas for you too, he seems to be the real welding guru on here

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