|
Hi Steve, Using flux cored Mig on lite gauge SM is like using stick electrodes. Both will get the job done but oxy/act, solid wire Mig with 75He/25Ar, or Tig will be a better process choice. Use alot of tacks as lite gauge SM likes to move and warp. The closer your tack welds are the last amount of warpage will result. Joint prep is critical for warpage control. The wider the gap, the more filler rod that has to be applied to the joint thus creating a stronger contraction creating warpage as the metal cools. Weld is position is critical. 45� vertical down is a great position as it lets you weld faster with sligtly less penetration and a slightly narrow bead width. With 75He/25Ar cover gas the He content will let the bead lay flater for less work during the shaping phase. For a home shop use 100% Ar works well and with correct joint prep and welder technique can be used as well as the 75He/25Ar mix. Pure Ar will cost 30% less than a Ar/mixed gas. I agree that Mig with .023 wire is a good size for lite gauge work. .030 also works well to about 22ga. T_Bone
| 
