Introduction to the difference between cold arc welding and argon arc welding
First, the working principle is different:
1, Cold welding machine is through the microelectric instantaneous discharge of high heat energy generated by the special wire melted to the damaged parts of the workpiece, and the original base material firmly fused, and the use of charging capacitors in the ultra-short period of time discharge. The contact part of the electrode material and the workpiece will be immediately heated to 80,000 ° C ~ 10,000 ° C, the ionized state of the molten metal through the metallurgical transition to the surface of the workpiece.
2, the basic principle of argon arc welding is to isolate the air from the molten metal in the welding area to protect the arc and the liquid metal in the welded molten pool from atmospheric oxygen, nitrogen, hydrogen contamination, so as to achieve the purpose of improving the quality of welding.
Second, the welding precision is different:
1, cold welding machine repair high precision, surfacing thickness from a few microns to a few millimeters, only need to grind and polish. Due to the cold welding machine heat is small, better overcome the shortcomings of argon arc welding, to make up for the maintenance of precision castings.
2, argon arc welding due to the large heat-affected area, often resulting in deformation, excessive hardness, sand holes, local annealing, cracking, pinholes, abrasion, scratches, biting edges, or insufficient bonding force and internal stress damage. Cold welding machine can be used in the field of repair of precision casting defects, rather than argon arc welding.
Third, the applicability of different:
1, Argon ARC welding welding stainless steel sheet, because it is hot welding, welding process temperature continues on the surface of the workpiece, easy to cause sheet
