by mbasaraba Mon Feb 13, 2012 5:58 am
I have 2 welders, a Lincoln 180 MIG and a Miller Diversion 180 TIG.
While TIG will give you a much prettier weld and can weld much thicker metal, for your average person this isnt a huge necessity. My MIG can weld up to 1/4 inch easily, I have built some heavy duty structures and have never had a failure.
I would recommend going with a 220 volt welder if you can, they have a much better duty cycle and will handle more use and last longer. I also picked up a SG100 spoolgun for my Lincoln that does a decent job welding aluminum as long as it isnt REAL thin stuff. The only problem with this is that it requires a different shielding gas than steel welding so you have 2 choices, buy 2 tanks or buy a 100% tank for aluminum and FLUX for steel. I hate using flux core wire so I went with option 1, the 100% tank I use for both my MIG aluminum and with my TIG.
The BIG difference between MIG and TIG is the price! You can pick up a Lincoln 180 at Lowe's with a $50 coupon for about $600, my Miller Diversion TIG was $2000. You can weld ANYTHING with a TIG and it looks 10X better than a MIG without all the grinding and rework but you can buy a ton of paddle wheels for an angle grinder for the $1400 difference.
Determine your budge, what it will be used for and power supply. If your going to use it in your shop/garage and if you got 220 available, spring for the 220 volt welder, you will be doing yourself a favor. You wont have to be looking for another welder if a heavier duty job comes up.
Check out all the online tutorials you can before starting to weld. Burning up a bunch of nozzles and having poor welds can be frustrating and ruin the experience not to mention be dangerous if it is a structural weld and it fails. Remember that just having a BIG bead on a joint is not what makes a good weld, the penetration between the 2 materials is the key, the bead is just filler material to make up for the 2 materials melting togethher.
Your machine settings make a huge difference so learn about your machine. If it has pre-setting selectors and not potentiometer dials (especially on wire feed rate), try to stay away from it as these can make getting a better weld, especially when first starting out, a lot harder
I agree with the others that if you are new to welding, stay away from TIG, it is WAY harder and takes a lot of practice. If you are not going to be welding 75% of your time on Aluminum and Stainless Steel, there is no need to waste the money on it. You can get a Lincoln spool gun for under $200 and will do most of the aluminum jobs a regular person in their shop could need.