Preparation before welding

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Preparation work before welding: use the hand wheel to clean the oil stain, paint, rust and so on. With the gouging welding crack plane cut, gouging to side of the body, and the welding base metal hardening area clean. After gouging by angle grinding wheel cut grinding formation (medial interface polished V groove), cleaning, pink check, confirm the cracks have been found and cleaned. According to the existing conditions of maintenance, use with 5mm type E5015 (J507) or E5016 (J506) electrode, at the temperature of 350 DEG C baking 2h, then incubated at 100 C, to prevent electrode moisture absorption, with welding current of 190 ~ 230A. Because the excavator plate thickness and welding should be Caigang watts equipment preheating welding to 150 to 250 DEG C; in the welding process, can be segmented, symmetric and backward method in welding; weld cooling process should continue to use the hammer to knock on the weld metal, to eliminate stress; welding on the corner when, in order to avoid landing arc defects, suitable for continuous welding, in order to improve the joint force.
After welding, thoroughly remove splashes, welding slag and welding, the weld reinforcement shall not be greater than 2.5 mm. Magnetic particle inspection of welds, no cracks and other defects are allowed.

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