Re: [MW:30828] Tube to Tube sheet welding, Orbital welding parameters for header box

What's the method for preheating?  You have to ensure whole thickness is covered for preheating to reduce the cooling rate. 

Regards

On Tue, 28 Apr 2020, 21:07 orbital, <satishcg@gmail.com> wrote:

Harness of BM: attached pic's for 0.65,0.083 & 0.095. I am doing something right on the 0.095 W as previously mentioned because it is pretty close to the 248 hv requirement. Readings attached.

On Wednesday, April 15, 2020 at 1:28:55 AM UTC-5, Ahmed Osman wrote:

- check the hardness of BM away from welding and what Is the welding HV values ?

- HAZ prosperities mainly related to the base metal 

- your base metal SA516 in normalised condition .. after welding the mech. priorities gained by heat treatment is lost unless u keeping the transformation temp. and cooling rate as the original treatment condition

- any way .. as much as u can try to increase HI for getting the lowest cooling rate 

best regards

On Thursday, April 9, 2020, 07:24:00 a.m. GMT+3, orbital <sati...@gmail.com> wrote:

Guys i am developing weld procedures for automated orbital welding and having trouble trouble with achieving required hardness.

SA-516-70N 2"Thk tube sheet / SA-179 1"OD x 6"Lg Tubes different wall thickness. Preheating 400 interpass 600 F

I am having isues with hardness on the heat affected zone. The criteria to meet is 248 Hv10 (vickers). Especially at the Haz zone iam getting 300 vickers.

Anyone have experience in tube to tube sheet welding can offer some suggestions that will be great.

My best results were in 0.095 wall thickness where HAZ readings were close to 250 still failed becauseit was marginally over. 0.065, 0.83 failed with HAZ hardness averaging at 300.

Best reagrds

Tesh

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