AKD802
HRC:≥40
Standard:
AWS A5.13 ECoCr-A
GB/T984 EDCoCr-A-03
Description: AKD802 is a surfacing electrode with titanium-calcium coating and cobalt-chromium-tungstenalloy core. DC reverse connection should be adopted. Surfacing metal can still maintain good wear resistanceand corrosion resistance at 650℃.
Application: Used in occasions where good wear resistance and certain corrosion resistance are required to work at around 650℃, such as surfacing high temperature and high pressure valvesand hot shear knives, etc., where impact and cold and heat are interlaced.
Typical Chemical Composition(%):
C:0.7-1.4 Cr: 25.0-32.0 W: 3.0-6.0 Mn:2.0 Si: 2.0 Fe: 5.0 Co:Rem Other: 4.0
Recommended welding parameters:
3.2mm: 350mm 120-160A
4.0mm: 350mm 140-190A
5.0mm: 350mm 150-210A
Notes on usage:
1. The electrode must be baked at about 150C for 1 hour before welding
2. According to the size of the workpiece and the type of base metal, it must be preheated at 300-600C. Low current short arc welding should be used.
3. After welding, it should be tempered at 600-700C for 1 hour and then slowly cooled, or the workpiece should be placed in a dry and hot sand box or plant ash and cooled slowly to avoid cracks.
