The pipe It is for boring into trees, the 4340 portion being threaded and the 4130 being the main shaft. Eureka 130 is 33-38 HRC as welded and 48-52 HRC when fully hardened.

Hi all, I was wondering which filler metal you might recommend for welding a normalized 4340 pipe to a normalized 4130 pipe of the same size (0.058" wall thickness). After welding the parts will be quenched at 1570°F and then tempered twice at 400°F. I was thinking that Eureka 130 might be a go...