Process control of heavy welded section

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Process control of heavy welded section

Process control of heavy welded section

The tacking welding: tack welding is the most prone to problems part of heavy section in the construction process. When tacking welding, the temperature at the welding location is quickly cooled by the surrounding "cooling medium", causing local excessive stress concentration and further causing cracks, which results in damage on the material. Measures:increase preheating temperature, increase the positioning weld length and size of fillet.

 

Multi-pass welding: In the heavy section welding process, an important process is to adhere to the principles of multi-pass welding, non-swing wide road. The advantage of multi-pass welding is:the former weld is a "warm-up" process for the latter weld and the latter weld is a reheat treatment process for the former weld, which efficiently improves the stress distribution during the welding process and helps to ensure the welding quality.

 

welding process checking: heavy welded section is different from the sheet, taking a few hours or even tens of hours to complete the welding component, thus strengthening the intermediate examination is particularly important to facilitate the timely detection of problems. Intermediate examination can not make the construction stopped, but keep the construction and checking continue at the same time, carefully check for cracks. Timely detection and timely treatment.