04 Oct 2021
With the mature development of cold welding technology, cold welding machine have been continuously used in various industries, and more and more people have begun to pay attention to the welding equipment of cold welding machines, but you are really interested in cold welding machines and cold welding welding technology. Do you have a thorough knowledge and understanding?
What is a cold welder? The cold welding machine is called ESD in the world, and it was developed by the experts of the former Soviet Union using the circuit principle similar to the electric discharge machine. The main purpose is to use high-hardness tungsten carbide and other materials to coat molds and metal surfaces to improve wear resistance, heat resistance, and burn resistance. The cold welding machine uses the high heat energy generated by the micro-electric instantaneous discharge to cladding the special welding wire to the damaged part of the workpiece, and it is firmly welded to the original base material.
We understand it literally, what does the "cold" of "cold welder" mean? As we all know, cold welding means that the parts are always at room temperature during the repair process, without internal stress, no thermal deformation, no cracks, no annealing, no softening, no potential effects of fracture, high bonding strength, compactness, no shedding, and wear resistance. , Reliable impact resistance and compression resistance. Obviously, the "cold" of the "cold welder" refers to the low temperature of the workpiece, whether it is welding or repair, cold welding can achieve low residual temperature on the surface of the workpiece after welding, and will not cause thermal deformation due to excessive temperature discoloration.
How to classify cold welders? We can divide common cold welders into three categories. The first category is the cold welding machine for tool and die repair, also called die patch repair machine. This type of welding machine uses steel flakes and powder as repair materials, and uses the contact resistance of the repair material and the tool to repair defects. The advantages of this type of machine are: low price, no need for argon protection, easy to carry, suitable for mobile operations, and especially suitable for repairing defects with a depth of less than 0.005MM. The second type is a high-precision metal repair welding cold welding machine. This type of welding machine uses fine wire as a repair material, and uses a precisely controlled high-energy arc to make the repair material and the part weld together with a good bonding force. The advantages of this type of machine are: high power, fast repair speed, can be widely used in various steel, copper, aluminum and related alloys, especially suitable for a large number of repairs. The third type is multi-metal defect repair cold welding machine. This type of welding machine uses flux-cored welding wire or electrode to remove the coating as a repair material, and uses sparks to discharge instantaneously to transfer the electrode material to the surface of the workpiece to be repaired. The welding material and the workpiece are fused together in a metallurgical way. It can repair various metals such as steel, copper and aluminum.
What is the applicable scope and material of the cold welding machine? The cold welding machine is suitable for almost all metal materials, and it is also suitable for repairing pinholes, pores, burrs, flashing, bumps, scratches, corner chipping, corner collapse, sand holes, cracks, abrasion, indentation, manufacturing errors, manufacturing defects, and welding Defects, sharp corners, sharp edges, grooves, side walls, bottoms, deep cavities, planes, parting, on-site repair on production lines.
What are the advantages of cold welding technology? First, cold welding is different from bonding in the general sense. The hardness, adhesion and strength of cold welding flux are particularly high, and there is almost no shrinkage rate. It can reliably prevent many chemical effects, physical stresses and mechanical stresses. It is also called It is "liquid metal". Second, cold welding can be used to interconnect, fix welding and seal all metals and almost all other raw materials. After hardening, it can be filed, planed, ground, milled, polished, turned, shot blasted, etc. just like metal, and can be processed with various tools. It is of great significance for repairing old equipment and reducing waste and defective products in the manufacturing process. Third, when some materials are connected by general welding method, due to the high temperature during welding, not only the strength of the material is damaged, but it is also easy to deform, especially for thin materials. However, these problems do not exist for cold welding, because cold welding is performed at room temperature, and the stress of the joint can be more evenly distributed on all the rubber surfaces, thereby improving the metal caused by welding, riveting, and bolting. Some of the above problems improve the fatigue life.
In summary, do you have a deeper understanding and understanding of cold welding machines and cold welding technology? Congratulations, you are one step closer to becoming a good welder.
Keywords: welding machine
Originally published 04 Oct 2021, updated 04 Oct 2021.