Re: [MW:12968] Cracking problem during Hardfacing (FCAW)

Dear Ajay,

Can you tell me after welding you did any post heating like DHT and how you cool  this hard facing after welding? You need to cool the coupon under asbestos cloth after welding or any post heating.

If you want to weld 2 1/4 Cr , 1 Mo material post heating is required to remove hydrogen content from weld metal. better to do post heating after welding and cool under asbestos cloth. slow cooling is required for hard facing overlay.


Regards

Vijay Katkar

On Sun, Nov 13, 2011 at 6:14 AM, ajay pawse <ajaypavashe@yahoo.com> wrote:

Hello Friends,

 

We are conducting trials for Tungsten carbide Hardfacing on F-22 material (2.1/4Cr - 1 Mo). we are facing problem of transverse hairline cracks on weldbead. need your help to overcome this problem.

Process: FCAW

Filler wire Dia: 1.2mm

Cuerrent used: during trial we changed current from 87Amps to 140Amps. different runs were taken but all cracked

Volts: 16 to 19.5V

Wire feed: 2.8 to 5m/min

Travel speed: 235 to 600mm/min

Preheat: 120 to 260DegC

Shielding: Argon

 

With these parameters, we achieved satisfactory weld bead appearance though.

 

Please let me know if i am missing any factor which is vital for the success of the process. also need you guidance on the parameters i tried.Hope to see your suggestions soon

 

Please let me know if anyother info is needed.

 

Thank you.

 

Regards,

Ajay

--
To post to this group, send email to materials-welding@googlegroups.com
To unsubscribe from this group, send email to materials-welding+unsubscribe@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.

--
To post to this group, send email to materials-welding@googlegroups.com
To unsubscribe from this group, send email to materials-welding+unsubscribe@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.