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The carbide tips are brazed firmly to the steel body. As soon as the enomously high temperatures generated during the milling process act on the components, the carbide in the tip and the steel of the pick head are subject to differential expansion. A brazing method play a important role at this time. Brazing can absorb those extreme tensile stress by tools reach high temperatures among the milling process.
Many manufacturers adopt Copper-zinc solder to weld the carbide tip to the steel body, the welding temperature can reach 900 Celsius and even more. But expansion coefficient of the carbide, copper-zinc solder and base metal is largely different, so their shrinkage degree is different. the shrinkage size is carbide< metal steel< copper. Thus there exist large tensile stress among them, which results welding strength decrease.
Our factory asopts silver welding technology to manufacture the picks cutter of road . It has high cost but it can realise the important brazing role in the milling process.
Summarize: The careful brazing of the tungsten carbide tip and the steel body ensures the tight bond of the materials.
