The shell of WPEKA40-70,WPEKA50-80,WPEKA60-100,WPEKA70-120,WPEKA80-135 planetary reducer is usually made of Gray iron, which is often affected or even scrapped due to cracks and other defects during use, resulting in great losses. When repairing at the construction site, due to objective conditions (without dedicated heating and insulation facilities) and environmental limitations, it is not possible to use the semi hot welding method for welding repair. When using arc cold welding, the heating of the workpiece is uneven, which is prone to the formation of large internal stress and the formation of cracks and white structure. The manufacturer of the Babman planetary reducer has conducted research and testing on this, adopted corresponding process measures, and successfully repaired the reducer shell through cold welding.
Planetary reducer manufacturer
For the repair of cracks in the gearbox housing, the welding measures taken by the planetary gearbox manufacturer are as follows:
1. Using short arc welding, the faster the welding speed, the better. After each welding section is completed, use a small hammer with a round head to immediately strike the weld seam to eliminate internal stress, refine the metallographic structure, and make the structure of the weld metal more dense.
To reduce welding stress, wait for the weld seam to cool to below 60 before welding the next section.
3. Due to the large groove, multi-layer and multi-pass welding is adopted. When the crack is long, the segmented back welding method should be used. The welding of the edge section of the weld seam is carried out from the end of the crack to the center direction of the crack, while the other sections are connected end-to-end to achieve stress balance to a certain extent.
4. The crack stop holes drilled at both ends of the crack should be left for final welding, and 23 drops of metal can be added with a short arc.
