Depositing AISI 410S on A516 will produce a martensitic weld overlay which is prone to cracking even during welding. There Are two solutions:
- Using a buffer layer (intermediate layer) of E309L or even E310L on A516 and then Depositing 410S
- Applying preheat of min 250-300 C which makes it a very hard job though it may seem less expensive
In first scenario, you do not need any preheat but I do not recommend using SAW for 410S layer since it may melt through the buffer layer and reach A516 which maybe, maybe causes problems. You can use GMAW with Ar+2%o2 or Ar+3%CO2. Do not forget the Preheat...
This way your weld overlay will be thicker than 3 mm and you should weld a PQR coupon to make sure you have 3mm of 410 weld layer "over" the buffer layer. Maybe you'll have to deposit one buffer (309L or 310L) and 2 layers of 410S. Try using Pulsed GMAW to get the results with depositing one layer.
One of our colleagues have successfully deposited one layer of 410 weld overlay on A516 using Pulsed-MIG (Preheat is essential). It's because Pulsed-MIG has less dilution and you may achieve required results in one layer.
For PQR, you need 4 side bend tests, chemical analysis on the surface of overlay and 3-4mm below the surface, and hardness test (on the surface).
Discuss these issues with your client before proceeding.
I have shell 20mm thick ( SA-516 Gr, 60 ) and there must be cladd AISI 410S 3mmCould anybody tell me which filler i can use, for SAW and GMAW?--GMAW i planning use for flanges and tubesheets ( after i overlay tubesheet - what is procedure for welding tube to tubesheet? )Also PWHT has been asked by customer after overlay.
Can anybody tell the effect of PWHT on SS 410S overlay?
What will be the the safe range of temperature of PWHT? ( Also recommended temperatures and times, holding cooling...)Best regards,Branko Ferencak
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/
http://www.linkedin.com/groups/MaterialsWelding-122787?home=&gid=122787&trk=anet_ug_hm
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.
---
You received this message because you are subscribed to the Google Groups "Materials & Welding" group.
To unsubscribe from this group and stop receiving emails from it, send an email to materials-welding+unsubscribe@googlegroups.com.
For more options, visit https://groups.google.com/groups/opt_out.
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/
http://www.linkedin.com/groups/MaterialsWelding-122787?home=&gid=122787&trk=anet_ug_hm
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.
---
You received this message because you are subscribed to the Google Groups "Materials & Welding" group.
To unsubscribe from this group and stop receiving emails from it, send an email to materials-welding+unsubscribe@googlegroups.com.
For more options, visit https://groups.google.com/groups/opt_out.
No comments:
Post a Comment