Precautions in the welding process

1, cast steel parts surface heap welding, the amount of overlap between the weld path shall not be less than the width of the weld path 1/3.

2, before welding must be completely remove defects, bevel surface should be repaired smooth and smooth, no sharp corners exist.

3、According to the defective condition of cast steel parts, the defects in the patch welding area can be removed by shoveling, grinding, carbon arc planing, gas cutting or mechanical processing.

4、Dirty materials such as sticky sand, oil, water, rust, etc. within 20mm around the welding area and bevel must be thoroughly cleaned.

5、In the whole process of welding, the temperature of preheating zone of cast steel parts should not be lower than 350°C.

6、When conditions permit, as far as possible in the horizontal position of welding.

7、Welding electrode should not make excessive lateral swing when welding.

8、Fasteners with specified tightening torque must be tightened with torque wrench and tightened according to the specified tightening torque.

9、The tapered pin and the hole should be painted and checked during assembly, and the contact rate should not be less than 60% of the fitting length, and should be evenly distributed.