Operation of pipe welding

1. When welding, the arc length should not be too long, and the welding pool should not be too large, otherwise it will cause poor weld formation or air holes.
2. Be sure to control the angle of the welding rod during operation to prevent slag inclusion defects. When the arc is extinguished, the arc is elongated until it is extinguished, and the arc crater is filled.
3. In order to reduce the residual stress, the root welding of the same girth weld is carried out by two welders at the same time.
4. The starting positions of the welds between two adjacent layers should be staggered by 20-30mm, and the welding arc should be carried out in the groove.
5. Each weld joint must be welded once in a row, and the interval between weld bead layers and the temperature between base layers must meet the requirements of the approved welding procedure regulations. Generally, the interval between layers should not exceed 5 minutes, and the temperature should be between 100-250°C.
6. After each welding joint is welded, mark the code name of the welder 100mm above the airflow direction from the welding joint, and no longer use steel stamps for marking.
7. In rainy days, when the wind speed exceeds 5m/s, the relative humidity exceeds 90%, and the ambient temperature is lower than the temperature specified in the welding procedure specification, welding is not allowed without invalid protective measures.