In a message dated 97-10-10 21:36:01 EDT, you write:
<< Do not weld on 4130 in the high temper states ie yield strength over
100,000 PSI. The weld arc will locally destroy the high yeild strength
you paid for and provide a discontinuity that provides a site for cracks
to start.
>>
Just got to reading the mail... I have to take issue with this as welding
4130 is how we build aircraft fuselages, race car frames, etc.... After
welding is finished the steel is re-tempered in the area of the weld by a
process called normalizing... This is a simple reheating of the weld area
with a gas torch to a specific color and allowing it to air cool (very still
air)... Any manual on aircraft welding will have specific instructions, many
with color photos... Check with the EAA (Experimental Aircraft Association)
to get a manual...
Denny
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