Posted by 135 Fan on January 05, 2009 at 22:55:46 from (68.149.56.30):
I'm working in a place that sells some welding supplies. A new customer has some aluminum welding to do and wants to use MIG with his existing machine. He wants to buy a 12 ft. MIG gun with a teflon liner to run .035 aluminum wire and .035 drive rolls. My boss, who thinks he knows welding, says a standard liner will work just fine. A teflon liner would only be needed on a 15 or 20 ft. gun. 15 ft. is the longest standard MIG gun. I've heard of custom made long guns but only for large diameter steel wires. I know the boss would have been offended if I said anything so I didn't. I haven't done a lot of aluminum but know people who have. Trying to feed aluminum through a standard MIG gun is just a recipe for frustration. If you had maybe a 10 ft. gun, special liner and the feeder hanging above the work with the cable dead straight maybe? it might work. Feeding steel wire can be tricky at times. Aluminum is a lot softer. There is a good reason spool guns and push/pull feeders like a Cobra-Matic were invented. So you could weld aluminum with MIG. I tried to ask the boss how much they had to do but he insists it will work fine with a standard liner and 12 ft. gun. It would make more sense to me to tell the customer that there are better options for doing aluminum than to sell them something else just to get a sale. I think the customer would appreciate it as well. As it is I think the customer is wasting a couple hundred dollars on another MIG gun. What can you do? It's not my place to say so I'm biting my tongue. Dave
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