Bridge box after box bulldozer easy to produce cattle major defect types are: Weld incomplete penetration, lack of fusion, weld and weld cracks and other defects; castings cracks, holes through sex, shrinkage and other casting defects; left and right shell precursors of welding parts welding Gading shape and positioning size tolerance, influence and fusion weld. For the following reasons:
  1. Multi-axle box parts, structure and distribution of the weld is more complex, a small space inside the box, welding operation is difficult. As in the outer shell off the floor with Deng drogue site, due to space is too small, the outside bottom of the left and right of the housing connections, unable welding and welding.
Bulldozers rear axle box
  2. screw plate after plate with the left and right casing joints small space, dead and more difficult the larger the welding operation, could easily lead to incomplete fusion welding.
  3. After the board and external connector shell off the corner weld bead easy off, easy to cause incomplete fusion welding.
  4. When the board is connected with the case for unilateral V-shaped internal weld seam, welding slope up poor, could easily lead to poor weld fusion.
  5. dirty bulldozer parts welding parts of the surface residual rust stains, oil, paint and chemical composition of steel blanks failed, causing pores, cracks and other welding defects.
  6. weld seam produced by incomplete fusion, weld, cracks and other defects in the structure of a water leak testing process plants generally easier to be found, and the ability to timely repair welding. But microcracks and small holes and other defects, due to the low pressure of a water leak test method, the leakage site in a relatively short period of time is not easy to be found. Bulldozer parts finishing.