E347H welding on 347H grade means welding bead is already having higher carbon. Carbon, sulphur & phosphorus are responsible for solidification cracking. Try to reduce the % of these elements in welding. Use properly baked electrodes. If it's a high load containing part then need to perform PWHT also. Try using E347 with carbon content upto 0.04% or use E347L with respective filler.
On Oct 31, 2017 6:22 PM, "aslab khan" <aslab786@gmail.com> wrote:
Use the highest welding speed possible. The faster the weld is conducted, the faster the cooling rate and the less time the weld is in the hot cracking temperature range.Try to use welding and assembly sequences and techniques that minimize restraint, reduce residual stress and produce welds of acceptable profile.This picture shows two fillet weld terminations in the corner of a welded structure. Cracking is visible in both termination craters. Also cracking is visible along the center of both welds. The reason for this hot cracking is undesirable weld profile caused by poor welding technique. The reduction in throat thickness at the termination and for a portion of the fillet weld has allowed the stresses developed during welding to fracture the weld.
Thanks & Regards,aslab a khanOn Tue, Oct 31, 2017 at 3:13 PM, Amul Raj <win.amul@gmail.com> wrote:Dears Experts,--Hydro cracker Unit, Heater Radial coil welding base material 347H and Filler wire ER347H(Metrode) Size 4' x 13.49 ThicknessWhen we start the welding, getting crack in the weld stop and start pointPlease advise meRegards,Amul Raj T
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