About Temper Bead Material AISI 4340

[manongd]

I have material AISI 4340 and need to welding repair becuase it Crack at near weldment depth 10-15 mm

crack after quenching . in my process is welding and then Stress relief and then Quenching and after that Crack !!

base metal 50 mm. fillet weld about 6-8 layer

i need recommand about detail to do WPS

i am a young engineer if who can recommand relly thank you

http://postimg.org/image/62wgsstg9/

http://postimg.org/image/62wgsstg9/

http://s28.postimg.org/9mieilw65/DSCF4837.jpg

http://files.engineering.com/getfil...5a64-42ca-be29-5c0235a6bf9f&file=DSCF4837.JPG

 

[metengr]

To get better responses to your post, please provide more specific information on how you welded the 4340 steel. What type of post weld heat treatment was performed?

 

[manongd]

GTAW by weldmold 919
Thermal stress relief +Quenching by oil+tempering
cooling in air

 

[metengr]

You can weld repair using either option below if suitable;

(1) No re-heat treatment. You can perform the weld repair and post weld heat treat to 20 deg C below the original tempering temperature for the 4340 steel (if it was originally heat treated).

(2) If this is a weld repair prior to final heat treatment, I would perform the weld repair, and go right into heat treatment - austenitize treatment, followed by oil quench and then temper. The weld metal should be a Cr-Mo-Ni alloy to respond similar to heat treatment as the 4340 steel.