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Have been doing A/C welding of 4130 for 30 yrs. both as an EAA Amateur and
for A/C manufacturing company under Mil. Spec. Cert. ,almost all A/C welding was done with Oxy./Acet. until the 1960's , at that time it was found that one could speed up production with TIG welding and the supply of skilled Oxy./Acet. welders was drying up , I understand that the MIG process has been approved for some time , a real shame that Oxy. has slowly been eliminated from the A/C manufacturing , won't go into the HAZ , Thermal Shock and loss of ductility thing as it is like religion and politics , it always starts a fight , for all around reliability with respect to welding 4130 , I would place Oxy./Acet. at the top of my list and TIG and MIG as second and last , Spirit Of St. Louis was Gas welded as was all of those old J3's , T Craft's . Happy New Year Phil Lohiser EAA 1273 "wright1902glider" wrote in message ... While browsing a bit more of that "good 'ole internet wizdom", I ran accross this page: http://www.ihpva.org/com/PracticalIn...materials.html Its a human-powered vehicle website, but on this page, the author seems to think that 4130 cro-mo steel can't be welded with an oxy- acetylene torch. Does this sound right? It was always my belief that we've been OA welding airplanes out of the stuff for decades. Who is wrong on this point? Harry "I'm still stuck in the wood-age" Frey |
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