1. Selection of welding materials
The welding materials of pressure vessel pipelines should comply with the requirements of construction specifications. The selected steel, welding materials and other auxiliary materials should have warranty certificates and factory certificates, and must pass quality inspection by the quality supervision department.
2. Control of preheating temperature
Before welding pressure vessel pipes, preheating must be performed to prevent welding deformation, cracks and other problems. The preheating temperature should usually be adjusted according to the requirements of construction specifications to ensure welding quality. During preheating, it should be heated comprehensively and evenly to avoid overheating or heating too quickly, which will affect the welding quality.
3. Welding parameter control
The control of welding parameters is crucial to ensure the quality of pressure vessel pipelines. Welding parameters should comply with the requirements of construction specifications and be strictly controlled. Parameters including voltage, current, welding speed, etc. must be determined based on the characteristics of the welding material and the technical requirements of the equipment. In addition, the welding heat input should be controlled in accordance with the requirements of the specification to avoid excessive heat generation and affecting the welding quality.
4. Weld inspection
After welding is completed, weld inspection must be performed. The inspection of welds includes appearance inspection, dimensional inspection, non-destructive inspection and destructive inspection. The test results must meet the specification requirements, and the welding quality must meet the technical requirements of the equipment.
