Tension mark may be caused on the precision piston rod while working, if it is not handled in time, the use of the product will be affected at a light level, and the hydraulic cylinder will not work at a serious level. How do we repair the tension mark? The slight mark can be repaired by local grinding and polishing, welding repair plus manual grinding method is used for the severe mark. if it is not handled in time, the use of the product will be affected at a light level, and the hydraulic cylinder will not work at a serious level. How do we repair the tension mark？The slight mark can be repaired by local grinding and polishing, welding repair plus manual grinding method is used for the severe mark.
Cause of tension marks: After dismantling the gas-liquid booster cylinder, a precision piston rod is found severely damaged and there are six tension marks on it side by side. The main cause of the damage: After the dust ring embrittled, the massive debris fell off, the dust ring loses the function of dustproof, also a lot of dust and impurities are accumulating around the expansion joint. In this situation, the impurities grinds against the piston rod directly which caused the tension marks. The tension mark then scratches the rubber seal assembly of the cylinder head, causing serious leakage of the hydraulic cylinder.
Repairing requirement: the filler and base material should be combined stably and smoothly. The required materials have to be high-quality and easy for manual fabrication. The manual processing should ensure precision piston rod diameter error is less than 0.06mm. After analyzing, the filler J422 electrode is chosen to be used. Because the acid electrode is not sensitive to rust, oil and water, it won’t produce hydrogenated holes easily. And the acid electrode is easy to operate, after welding, the finished product is of good appearance. Also, it is high-quality and easy for manual fabrication. The stable arc, deep fusion, stable combination with base metal are also the advantages.