MIG "trigger" welding

[gawdodirt]

So if pumping the pedal when TIG welding is also incorrect, what is the correct form? Just using a pulsing TIG machine where the pulse is built into the machine? Isn't that accomplishing the same thing?

This is exactly right . On higher end welders, you have the option of having the machine do the work. And it is preferred method for critical welds. Lincoln and Miller both highly tout the method of pulsing the current to MINIMIZE HEAT INPUT. Too much heat IS as bad as too little. Do some research.

GD

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[Samco Fab]

Adding a bit of throttle as you dip the filler seems logical to me, the filler cools the weld puddle so that it needs more heat. I suppose fully on and off the pedal would be bad, but modulating the heat imput as you add filler has to be a good idea. There is a lot of ways to skin a cat, and a lot of good welding techniques.

If you look at a Robby Gordon truck (double pass weave) , a Mike Smith or SPD truck (traditional constant pedal dip...dip...dip...) , or a Geiser/ Jimco (pedal modulation while dipping) they are all welded with different styles and they are all strong and beautiful.

Proper heat imput overall, and proper amount of filler is more important that the style of tig in my book.

[mikeyfrombc]

http://www.millerwelds.com/resources...=story142.html

funny they mention pedaling the amperage here and this is one of the top chassis builders in Top Fuel .

[kdm73091]

no whats funny is how this thread turned into a tig pulsing thread... look at the title, it clearly says mig.... between tig and mig pulsing are two completely different welds....

[gawdodirt]

no whats funny is how this thread turned into a tig pulsing thread... look at the title, it clearly says mig.... between tig and mig pulsing are two completely different welds....

Not really. When you look at the wave form of the current, they are the similar. When I trigger
Weld, I raise the voltage to compensate for the cooling period. Just like a TIG pulse does. The penetration is as good if
Not better. And it looks much better.

[fathead]

http://www.race-dezert.com/forum/sho...rigger+welding

Here it is, the famous trigger welding thread. I was the one that did the test. It passed...

[Jerry Zaiden]

So if pumping the pedal when TIG welding is also incorrect, what is the correct form? Just using a pulsing TIG machine where the pulse is built into the machine? Isn't that accomplishing the same thing?

Using the pulse setting correctly is for certain metals, thickness, look etc. but on .120 or thicker material in a structural application trigger and pulse is just plain not correct. Like i said it is done by people who cant control the heat, dont have the proper technique, and plain just don't weld correctly. Argue it all you want. Go take welding classes then come back here and lets see what you have to say.

Good skill no pulse.

[atomicjoe23]

AWESOME pic!!!

[garagebuilder]

Welding is very simple concept. It's just a very concentrated casting. Get the parent materials hot enough that they will "wet" and accept molten filler, the more constant you keep the variables (heat, filler, speed) the higher quality the weld.

Pulsing of any type, mig or tig, isn't the best choice, but it works if you scale the heat up so that the material is heat soaked properly. I try to pump the pedal as little as possible, it takes longer and it usually doesn't lay as flat/smooth as constant pedal, there are situations where is is necessary though.

[richard cretsinger]

I feel that there should be no pulsing for mig welding, either you have skill at doing it correctly or you dont. There are to many people who rely on there machine to figure it out for them "millermatic skills" but a skilled welder can figure out if its to hot or to cold. Or open the lid, most welders have a pretty close calculation of where you should be at for what your welding. Pulse mig is for those that cant make it look good any other way, I agree, to much cold hot, cold hot is bad, especially on chromo is a bad thing. i would think it would make it brittle. Im just a garage slut that doesnt know how to measure things, so take that for what its worth. Those lower arms look good jerry.