What is the main problems in the welding process of woodworking knives?
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What is the main problems in the welding process of woodworking knives?
After cleaning before welding, add brazing filler metal and flux between the blade and the cutter body, fill the welding gap after melting, complete the firm welding of the blade and the cutter body, and perform reasonable heat treatment on the brazed carbide blade to reduce Small welding stress prevents cracks. There are two main problems in welding cemented carbide blades on the steel body using welding technology:
- Because the linear expansion coefficient and thermal conductivity of the carbide knives and steel are different (the linear expansion coefficient of cemented carbide is 5～7×10-6/℃, while that of steel is 11～14×10-6/ ℃), when the blade is cooled under the high temperature of welding, internal stress is often generated, resulting in cracks in the blade.
- Due to the poor wettability of common solder to cemented carbide, the blades are often not welded firmly, which will cause desoldering under the impact of cutting force.
Therefore, in order to prevent welding cracks and desoldering phenomena, it is necessary to study the welding stress, solder wettability, flux and welding process specifications during the welding of cemented carbide woodworking tools.
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