Welding patch panels

[taank]

Having a **** ass time fixing po's welds . The patches are so thin I burn through instantly with my welder at it's lowest setting! Must have been from if Whitney or something. Since now I'm going to redo everything. Where is the best place to get a complete floor and inner and outer rockers. Better yet I should just order a fiberglass cab and be done with it.
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[EZ4U2C]

What kind of welder are you using?

[taank]

Millermatic 175 230 volt. Using 75/25 gas .024 wire
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[my67c20]

Your setting is way too low. I have the lincoln 135 weld pak had it set at the C setting (not sure of what that is on the Miller) also the wire speed at 6.5. Layed out a nice spot everytime. Gas should be at about 15psi. Ultimatly you want high amps fast wire speed. Listen for the bacon.

[taank]

Originally Posted by my67c20

Your setting is way too low. I have the lincoln 135 weld pak had it set at the C setting (not sure of what that is on the Miller) also the wire speed at 6.5. Layed out a nice spot everytime. Gas should be at about 15psi. Ultimatly you want high amps fast wire speed. Listen for the bacon.

for thick metal yes. for sheet metal no. millers recc. setting is 1.5 volatge and 40 wire speed.

[lakeroadster]

I am guessing the problem is the PO ground down the weld and thinned out the base metal. You are kind of screwed if that is the case.

[EZ4U2C]

Hey taank,

Try this, find a piece of aluminum 1/4'' thick grind the area behind where you're going to weld. Clamp if you can the aluminum if not hold it tight against the metal. Spot weld in the middle of the area let cool and work your way out. Once it cool pop the aluminum lose. Steel weld won't stick to aluminum. Just a thought it's worked for me many of times

[MotorSeven]

40 wire speed sounds high...have you tried it lower?

[lakeroadster]

Originally Posted by EZ4U2C

Hey taank,

Try this, find a piece of aluminum 1/4'' thick grind the area behind where you're going to weld. Clamp if you can the aluminum if not hold it tight against the metal. Spot weld in the middle of the area let cool and work your way out. Once it cool pop the aluminum lose. Steel weld won't stick to aluminum. Just a thought it's worked for me many of times

Good suggestion EZ4U2C. I have a piece of copper and a piece of brass that also works well as a removable backer bar.