The bucket teeth of high manganese steel can be repaired by the following surfacing process after large area wear. The bucket teeth manufacturer of excavator analyzes the surfacing repair steps of bucket teeth
(1) The original work hardening layer is removed by grinding the surface of the base metal for 2-3mm with a grinding wheel. When there are cracks in the base metal, V-groove should be opened to completely remove the cracks.
(2) A202 electrode was used for backing welding, and the electrode was baked at 150 ℃ for 1 h; D256 electrode was used for surfacing, and the electrode was baked at 300-350 ℃ for 1 h. The welding rods are both AC and DC.
(3) First, fill the V-groove with A202 electrode and short weld bead, and then carry out zone by zone backing welding. Zone the surfacing part according to the width of 60-80mm, and the gap width is about 10-30mm, as shown in Fig. 2-35. After each zone is welded, the gap part is welded.
(4) When surfacing the surface layer with D256 electrode, it is also overlaid in sections as shown in Fig. 2-35 until the required thickness is reached, and then the gap is overlaid.
(5) In the process of surfacing, attention should be paid to prevent the base metal from overheating. If necessary, a part of the base metal can be immersed in water for surfacing.
The patch cut from the tractor track plate (made of high manganese steel) is welded with the tooth tip first, and then overlaid. The size of the patch depends on the lack of meat. When welding with d266 electrode, the welding sequence of symmetrical alternation shall be adopted to prevent cracks. When surfacing, the bucket teeth should be placed obliquely and horizontally from bottom to top. When one layer of surfacing is finished, slag shall be removed, and the other side shall be turned over for welding. After one layer of surfacing is finished, the second layer of the first surface shall be turned over for surfacing, and this shall be continued until the original size is restored. Avoid overheating and crack during surfacing.
Excavator parts production
Add：Ma Jia Cun He Xi, Lutou Town, Longkou City, Shandong Province