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Re: [MW:34375] REGARDING ISSUE IN MONEL 400 TUBE TO TUBESHEET JOINT WELDING

By Materials & Welding
Hi
Monel T/Tsht jt welding needs practice to welder for manovering the arc and welding direction
7 o clock to 2 o'clock 6 o clock to 10 o clock  3  to to 11 and.9 to1
As monel weld pool is sluggish hence Groove angle should be shallow with 35 to 40 degree
Increase the current with arc direction should be directed toward tube sht side and not on tube
Try with 1.6dia wire
Try and practice
Regards
Hegde

On Tue, 4 Jul 2023 at 10:07, Saurabh Joshi
<saurabh.joz30@gmail.com> wrote:
Dear All, 


       We are facing cracking  of tube ends , dis-bonding between tube base material and filler material during welding in Monel 400 Tube to Tubesheet Joints. Refer attached photographs.
Tube MOC: SB-163 UNS-N04400; 25.0 mm OD x 2.0 mm thk
Tube sheet MOC: SA-336M Gr F304L + SB-127 UNS-N04400 (48 + 10 mm thick clad by Explosion Bonding)
Welding: ERNiCu-7 GTAW filler size 2.0mm  with Argon shielding gas.


Kindly share the reason for such cracking, disbonding  and Suggest Corrective and preventive actions regarding this issue.

Thanks in Advance.

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