In order to prevent the arm from being scrapped because of the cracking of the front fork and the, and to avoid causing greater economic losses, appropriate methods can be used to strengthen and repair to increase the local strength. The specific reinforcement and repair methods are as follows:
1.Parking excavator
Place the arm smoothly on the ground to ensure that there are no ensure the safety of grinding and welding.
2.Grinding paint
The surface of the welding area can not be painted, the paint should be polished clean. If the weld seam of the front fork of the arm is too high, the strengthening plate can not be fitted, the weld seam should be polished, and the base metal should not be damaged when grinding, the grinding area must exceed 50 mm. in the welding area.
3.Repairwelding cracking site
In order to prevent further diffusion of cracking weld, repair welding should be carried out. There can be no arc pit, edge bite and crack in the arc starting position and arc closing position, and no repair welding can be carried out if the crack is small.
4.Welding stiffener
Ensure that the stiffener and arm fit, fixed by spot welding, solder joint should be less than 5 mm. Spot welding is not allowed to exist arc pit, edge bite and other defects. The angle of strengthening plate should be smooth transition, welding can not have defects such as slag inclusion, groove should not be filled with more than high, if need to be polished flat. After welding, clean the welding slag around the weld and smooth, smooth transition, no sharp angle and protruding.
5.Spray paint
The main function is to prevent corrosion to ensure the quality and service life of structural parts.