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rochog 02-07-2002, 11:36 AM weldind on 4140 should I leave this up to a shop, or can it be done at home with a mig., tig., or flux core, or stick? Need help this is going to be for the steering for my truck. PIG 02-07-2002, 11:54 AM Why 4140? Why not a lower carbon? GOAT1 02-07-2002, 12:13 PM Are you going to heat treat it? You are probably not so you may as well just use the ER70S and MIG or TIG it. I would TIG it so you can get better penetration. You should also pre and post heat to at least 500 deg F. If you are not going to heat treat it, you may as well make it out of low carbon steel. crawler#976 02-07-2002, 01:31 PM we use 4140 in high strength/toughness aircraft parts- usually in billet or forgings- very rarely in weldments. we just finished a project that was previously a billet part. our results were not good- 4140 is subject to embrittlement after welding- our customers require that we normalize 4140 after welding, and heat treat to required hardness- all very costly proceedures. the last group of 4140 weldments came back after mag partical inspection with substantial internal cracking, we lost almost 80% of the parts- if possible, use another material- later weldpro 02-07-2002, 01:54 PM Crawler -LOST 80% :eek: thats to bad. I would agree about using a lower Carbon grade especially hearing that a shop who probably knows what their doing lost 80% after mag inspection. If you must weld it I would use tig ONLY with like said above a er70s2 or maybe er80s2 Do Not use a 4130 unless a post heatreat is going to be done. Do you have pics of what you are doing? It might help others help you better. weldpro CHOKEu 02-07-2002, 05:01 PM Originally posted by crawler#976 we use 4140 in high strength/toughness aircraft parts- usually in billet or forgings- very rarely in weldments. we just finished a project that was previously a billet part. our results were not good- 4140 is subject to embrittlement after welding- our customers require that we normalize 4140 after welding, and heat treat to required hardness- all very costly proceedures. the last group of 4140 weldments came back after mag partical inspection with substantial internal cracking, we lost almost 80% of the parts- if possible, use another material- later Just curious... Was the NDT conducted by inhouse or was it outsourced?? CHOKEu 02-07-2002, 05:05 PM Originally posted by rochog weldind on 4140 should I leave this up to a shop, or can it be done at home with a mig., tig., or flux core, or stick? Need help this is going to be for the steering for my truck. rochog, let me know if you need a hand. I have a pyrometer and have done my fair share of 41xx series. I'm in Santa Clara. Kevin livermore2 02-07-2002, 05:52 PM only use a tig with super high tinsle rod. not the cheap stuff! | |