Carbon steel pipe & tube welding process requirements:
Preparation before welding:
1. Confirm the thickness and material of the pipe and select appropriate welding materials.
2. Perform surface treatment on the base material to remove impurities such as oil stains and oxides.
3. Check whether the equipment and tools are in good condition to ensure safe operation.
4. Measure and mark the pipes according to the drawing requirements to ensure the accuracy of welding.
Selection of welding materials:
1. The selection of welding rods should comply with the requirements of pipe material and thickness. Standard welding electrodes such as AWS E6010 or E7018 are usually used.
2. Gas shielded welding uses appropriate gases such as CO2, Ar, He, etc. to ensure welding quality.
3. The selection of welding wire should also meet the requirements of pipe material and thickness. ER70S-6 alloy steel welding wire is usually used.
Key points of welding technology:
1. Use the correct welding position to ensure the quality of the welding joint.
2. Control appropriate welding current and voltage to prevent overheating or underheating of welding.
3. Ensure the speed and uniformity of welding and prevent defects such as welding slag and pores.
4. Use appropriate welding angles and positions to ensure the stability and quality of the weld.
5. For large-diameter pipes, use segmented welding method to ensure the tightness and quality of welding.
Post-weld treatment methods:
1. Remove slag and clean the weld to ensure the quality of the weld.
2. Perform post-weld heat treatment or mechanical processing on the weld to improve the strength and corrosion resistance of the weld.
3. Repair and deal with the pores and defects produced during the welding process to ensure the integrity and quality of the weld.
In short, the welding process requirements for carbon steel pipelines are very strict. It requires mastering certain welding technology and experience, and paying attention to related operations before, during and after welding, in order to ensure the welding quality and the safety and reliability of the pipeline.
