I have a customer that has been using Lincoln SP-100's for years to weld AL with decent results. Amazingly, they have found that the regular wound steel liners work better than the nylon ones, and they are pushing .035 wire with them. They are a sign contractor and are, of couse, only welding light gauge material with them. I was blown away the first time I saw one of their machines come in the shop, thinking they were idiots for trying to a) Push small diameter Aluminum, b) trying to weld it with a 115v machine, and c) using steel liners. Worse yet, they run them off portable generators to do roadside repairs. Once the machine was fixed, the guy brought over some of the material they were welding and proceeded to put down a decent bead with the thing. They've got about a half-dozen units set up this way and use them all the time. Keeping the gun straight and changing liners frequently allows it with very few birdnests. I have since been setting other people up with steel liners instead of Nylon or Teflon when pushing AL, with improved results. They do require more replacement or cleaning. I've also "engineered" a Lincoln spool gun onto a Century 140 amp mig (the guy INSISTED). It worked well also.  |