Repair method of stainless steel piston rod

First clean the parts to be welded, and then use wet mud to surround the pull marks. Choose a welding rod with a diameter of 2.5mm, adjust the current of the welding machine to 120A, and use the straight-line method to perform welding smoothly. After all the welding is completed, clean the mud and slag, and use a rough file to repair the piston rod along the circumference of the piston rod. The outer diameter of the piston rod is sawn along the axis, one is the rough mold and the other is the fine mold. Coat the inner wall of the rough mold with a thin layer of red stamp oil, then press the rough mold against the part to be repaired on the piston rod to reciprocate several times along the axis, and then use a fine file to file off the heavier red stamp on the piston rod. Repeatedly repair the file, and finally the machining allowance. Then use 320-mesh sand bar dipped in kerosene to match the precision mold to grind the piston rod to the specified size. Finally, the back of the emery cloth was dipped in kerosene for manual polishing. After measurement, after the crane was repaired, after a year and a half of use, the luffing hydraulic cylinder has never leaked, and the piston rod is smooth and free of rust spots.

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