Re: Lost mechanical arts

Posted by carvel minne farmer on January 28, 2018 at 20:32:31 from (207.228.78.64):

In Reply to: Lost mechanical arts posted by notjustair on January 28, 2018 at 06:41:09:

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Thanks. Always good to hear advice and experience on these things before buying. As you might guess, I want one that can weld old car bodies without burning holes in them. The arc I'm using is very hard to get a decent weld without burning through. And I've had lots of practice with it.[/quote] rusty when I'm welding car bodys or thin metal I use a method I call stich and go, after you get your piece in place just hit the trigger and as soon as the arc is established let go, you should have left a spot weld about the size of the end of a pencil, move to another corner repeat, until you have the piece firmly spot welded in place, move back to where you started do a couple of more spot welds, move back to the other side a couple of more spots, using this method you keep the heat input in any area to a minimum and your new piece and the will not warp or pull. (an old timer body man showed me how) takes more time, more patience but a lot nicer finished job. you will be surprised at what you can do with a mig rusty compared to a stick machine, you can jump a 1/2" gap, or weld a half inch plate with ease, one of the senses you will be using with a mig more than a stick machine is your ears, you want to hear a nice bacon frying sound, no spitting, poping, you want the wire feeding smoothly not stabbing into the puddle. once you've got that mig and you dialed in your old stick welder will be gathering a lot of dust. keep your mig gun as straight as you can from the machine to the work, it's a lot easier on the wire feed motor and your drive wheels, and at least once a year pull the covers off the machine and blow all the metal grinding dust out, that gets in there while your welding. another tip while your welding rusty is to pay close attention to the colour of the puddle, especially on thin metal, if you stay to long in one place you will see the puddle turn from red to orange to white, if the puddle has got to white your a micro second from blowing through and making a hole that you will have to let cool right down, and go back and refill with the stich and go method. order .035 wire and drive wheels and tips or if your just doing thin metal .030 is good. john.

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