... .GL,BV,NK,KR,LR etc Instruction: HXJ422 is carbon electrode with calcium titanate type coating,excellent welding process performance,stable ... welding arc,beautiful welding,little spatter and can be used with AC ... X radiographic requirements: Grade 2 Reference current:(AC or DC+) Electrode diameter(mm)φ2.5φ3.2φ4.0φ5.0Electrode ...