Dear friend ,
this may be related to high heat input especially the cracks location in photos mention the points of doubled heated times .
high temp. with Ni/Cu alloys make carbides precipitate easier leading to cracks also coarse grain size which increase with heat have more tendency to crack as precipitation area increase
Best Regards ,
AWS CWEng. Ahmed Osman
On Monday, August 30, 2021, 11:42:03 a.m. GMT+3, Jeya Prakash <jeyaprakashjj@gmail.com> wrote:
Dear Experts,
-- We are facing cracking issues during welding in Monel 400 Tube to Tubesheet Joints. Refer attached photographs.
Tube: SB-163 UNS-N04400; 25.0 mm OD x 2.0 mm thk
Tubesheets: SA-336M Gr F304L + SB-127 UNS-N04400 (48 + 10 mm thick clad)
Welding: ERNiCu-7 GTAW filler wire with Ar shielding gas.
crack locations: weld toe on tube side, tube ends.
Kindly share the reason for such cracking, and precautions required during Monel 400 welding.
Thanks in Advance.
Regards,
Jeya Prakash. J
https://materials-welding.blogspot.com/
https://www.linkedin.com/groups/122787
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