How to avoid crack when deopsite weld for valve sealing surface?
Many factory Welding Worker face potential crack risk when deposite weld valve seat and disc, especially for those experience less fresh welding worker.This phenomen is more widely exsist for complicated workpieces when using easy-crack electrode.
Surfacing in the most commonly encountered problem is cracking, to prevent cracking of the main methods are:
1, preheat, interpass temperature control, slow cooling after welding.
2, stress relief heat treatment after welding. Continue reading “How to avoid crack when deopsite weld for valve sealing surface?”
China Main Valve Sealing surfaceing Electrode Character,Use,Application
D502 valve surfacing electrode line with GB EDCr-A1-03
Description: D502 is a titanium calcium type coating 1Cr13 valve welding electrode, AC and DC welding technology is good. Surfacing metal is 1Cr13 semi-ferritic chromium steel. Surfacing with air quenching properties, generally not subject to heat treatment, uniform hardness, but also softened by annealing at 750-800 ℃, when heated to 900-1000 ℃ air cooling or oil quenching, re-hardening.
Uses: This is a versatile surfacing welding rod for welding temperature below 450 ℃, carbon steel or alloy steel shafts and valves.
Chemical Composition of Deposited Metal (%) Chemical composition CSP Cr total of other elements
Guaranteed value ≤ 0.15 ≤ 0.030 ≤ 0.040 10.0 ~ 16.0 ≤ 2.50
Surfacing layer hardness: (after welding, air cooling) HRC ≥ 40
Reference current (AC, DC) electrode diameter (mm) φ2.5 φ3.2 φ4.0 φ5.0
Welding current (A) 50 ~ 80 80 ~ 120 120 ~ 160 160 ~ 200 Continue reading “China and main country Valve Welding material(electrode) for sealing surface”