Re: [MW:32498] Cracking of Monel 400 TTS welds

Super duplex spec may be SA789 S32750

Filler wire ER 2509 or ER NiCrMo3

Heat input shall be within 0.5 to 1.5kj/mm

Interpass shall not exceed 100 deg celsius

THANKS & BEST REGARDS,

KG.PANDITHAN, BE, IWE,  CSWIP 3.1,

ISO 9712 Level 2 in VT,

ASNT-Level II in PT,MT,RT & UT,

LA ISO 9001-2015,

International Welding Engineer. 

CONSULTANT-WELDING & QUALITY

Mobile no: +919940739349

On Tue, Aug 31, 2021 at 9:21 AM Jeya Prakash <jeyaprakashjj@gmail.com> wrote:

Dear Experts,

Thank you all for the reply.

As an alternate option we are planning to change the tubes from Monel 400  to SA 789 S3750 Super duplex tube.

Kindly suggest the filler wire for welding this dissimilar joint.

Whether it is feasible to weld this dissimilar joint.

Thanks in Advance.

Regards,

Jeya Prakash. J

On Mon, Aug 30, 2021 at 4:07 PM Chiranjeevi A <chiranjeevipuvvula@gmail.com> wrote:

Dear Jeya,

  It is due to high heat input

Regards

Anil

On Mon, Aug 30, 2021 at 9:42 AM 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

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