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The welding stress caused crack characteristics

Carbide inserts on crack, in some cases because of the welding stress is exorbitant, more than a hard alloyed blade intensity. When in welding, cutting dao should be greater than the high altitude ht3 hc blades. If, in hc/ht after welding, easy cause alloy blades fracture (see figure 1a),

If the hc/ht < 3, hard alloy surface tensile crack also easy,

When hc/ht = 4 ~ 5, hard alloy surface, no significant stress to crack, even if there is no obvious, crack

In hc/ht < 8 in welding layer, produce uniform load. While alloyed blade thickness direction along the alloyed blade bending stress produced in the welding layer, the intensity distribution of force than alloy itself, because it is not just more complex in a plane, and in two, three or four surface.

In addition, carbide heating and cooling rapidly due to rapid heat distribution and may produce significant instantaneous stress. In rapid heating, carbide outer compression stress among, by tensile stress. More than allow heating speed, they might crack or internal invisible cracks. Hard alloy welding, rapid cooling is very dangerous, in this case, the outer appearance and tensile stress, the crack of alloy.

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