chromemoly tubing

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tig or mig? what does it weld like? what filler or wire ,what gas? /  miller 252 mig or the dynasty 300dx tig is what i have acces to.    hap
Reply:Type 'chromoly' in the search box above.It has been discussed a bazillion times.
Reply:Either is fine, ER70S-6, or -2 is fine. With tig 100% argon. For mig C-25, C-10 pretty much any mig shielding gas would work. --Gol'
Reply:Originally Posted by haptig or mig? what does it weld like? what filler or wire ,what gas? /  miller 252 mig or the dynasty 300dx tig is what i have acces to.    hap
Reply:i TIG 4130 everyday, and use s-2 with 100% argon for Formula and Baja SAE frames and other members (this is for parts NOT going to heat treatment though)for heat treated parts, you must use 4130 filler only! (for 4130 chromoly that is)Last edited by BLUE2KSS; 10-03-2008 at 02:28 AM.Mechanical Engineer
Reply:thanks all, and next time i'll use the search box
Reply:Before welding chromoly make sure you preheat to about 250º to get rid of any moisture(use a temp crayon to make it easy) and make sure it has no machining oil on the weldment.The difference between MIG and TIG.The TIG process has a lower heat input and deep penetration.Weldment must be prepared properly.The MIG process has a higher heat input and the penetration is more dependent on your machine settings and preparation of the weldment.Last edited by Donald Branscom; 10-03-2008 at 06:18 PM.AWS certified welding inspectorAWS certified welder