Quality Control in Welding Processes

Welding quality significantly impacts the manufacturing quality of low-temperature pressure vessels.

Control Points in the Manufacturing and Installation Process

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Welding quality significantly impacts the manufacturing quality of low-temperature pressure vessels. Preventing cold and hot cracks in low-temperature steel welding is crucial, focusing on maintaining low-temperature toughness in welds and heat-affected zones.

3.1 Preventing Cold Cracks in Low-Temperature Steel

The causes of cold cracks involve stress, quenching structures, and diffused hydrogen content. Measures to prevent cold cracks include reducing hydrogen sources, selecting suitable welding parameters, strict quality control in fitting, and preheating and post-weld heat treatment.

3.2 Preventing Hot Cracks in Low-Temperature Steel

Hot cracks result from stress, impurities, and chemical composition. Control measures involve alloy composition adjustments, proper preheating, correct welding parameters, and post-weld treatments.

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The destruction of pressure vessels at low temperatures is influenced not only by the quality of the steel but also by manufacturing and installation defects causing internal stress concentration.

Control Points in the Manufacturing and Installation Process

Welding quality significantly impacts the manufacturing quality of low-temperature pressure vessels.

Quality Control in Welding Processes

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