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Q. I need to ask you a couple of questions concerning a TIG welder.I have a Miller Econotig welder, and I need your help. What type of gas do you use with a TIG welder when welding chrome-moly tubing? What filler rod should be used to weld 15/8 .083" thick chrome-moly tubing? And what size Tugsten should I use? On the gas issue, should I use 75/25 or straight argon? Thank you. (Submitted by: Craig Orick from Lafollette TN)
A. Thanks for the question. Whenever you are TIG welding, you should use an inert gas (Argon or Helium or a mix of the two). I would use a 3/32" size 2%tungsten sharpened to a point, straight Argon, and an ER70S-2 or ER70S-6 filler on your tubing. I assume it is for a race application where strength and flexibility are an issue. Keep your heat input to the base metal at a minimum. Too much heat input will require a stress relieving of the welded area. Good luck and thanks for the question.
A. Thanks for the question. Whenever you are TIG welding, you should use an inert gas (Argon or Helium or a mix of the two). I would use a 3/32" size 2%tungsten sharpened to a point, straight Argon, and an ER70S-2 or ER70S-6 filler on your tubing. I assume it is for a race application where strength and flexibility are an issue. Keep your heat input to the base metal at a minimum. Too much heat input will require a stress relieving of the welded area. Good luck and thanks for the question.