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