Doesent increasing heat input accelerate cooling, provided i cant control the quick loosing of temperature from the interpass. I was thinking about increasing roatational speed and simultaneously reducing amperages, which somewhat keeps the cooling rate down.
On Wednesday, April 15, 2020 at 1:28:55 AM UTC-5, Ahmed Osman wrote:
-- 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 ratebest regardsOn 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 FI 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 reagrdsTesh
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