Please, take care of process variables to avoid hot cracking particularly you should be concerned about wire feed rate, of the both the trailing and the leading filler wires.
Interpass temperature with subsequent cleaning of the beads should also be monitored.
Moreover as described the joint configuration and wire size need to chosen smartly to avoid any entrapment of slag.
Obviously, thermal conductivity is going to play an important role, in that regard I suggest you to select optimum heat input and to use a granular flux.Interpass temperature with subsequent cleaning of the beads should also be monitored.
Moreover as described the joint configuration and wire size need to chosen smartly to avoid any entrapment of slag.
On Mon, Oct 14, 2013 at 9:00 PM, Ramin Kondori <raminkondori@gmail.com> wrote:
I do not recommend you tandem arc unless you use small diameter wires (1.6mm) in which heat input is not much different than that of single arc with larger dia wires (2.4mm). So my recommendation is to use single arc. Keep interpass temperature as low as possible (even cooling with water etc.).Of course we were using K-configuration for our joint and yours is J-configuration which is much better.If you use tandem arc, heat input will be higher and you may face problems.In tensile test, elongation did not reach min requirement.Dear Hrushikesh:I had an experience with 304L (67mm) plate and we used 3.2mm wire (single arc SAW) and we were checking interpass temperature regularly.
Hot cracking should not be your main concern but impact test might cause you problems.
Our impact test was at -120 deg.C and almost all specimens, had a shear type fracture surface with very low lateral expansion (rejected). Impact tougness were mostly between 28 and 40 J.
RegardsOn Sat, Oct 12, 2013 at 6:58 PM, Hrushikesh Sangamnerkar <hrushi612@gmail.com> wrote:Dear all,--Base Material: SA 240 Type 304/304LFiller Metal : SFA 5.9 ER 308/308L (2.4mm/3.15mm dia)Joint Design: "J" grooveRoot face : 5mmBack chip is allowed.I am in process to qualify PQR for Tandem SAW.Since thermal conductivity of SS is low.1) What precautions are required to be taken while caring out Tandem SAW specially for SS.2) Are there chances of solidification cracking? If yes, what can be the possible reasons and precautions to be taken.3) Does thermal conductivity have any role to play with cracking?Kindly provide your suggestions.Awaiting the reply.Thanks and regards,Hrushikesh H Sangamnerkar09724738118
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.
--
Manisch Kumar,
email- tetrabirk@gmail.com,tetra_birk@rediff.com
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