February 2018

Special Focus: Materials Manufacturing

Improve welding technology for heavy-wall pressure vessels in creep-resistant steel

The standard practice recommended for high-pressure vessels with heavy wall thickness requires the implementation of weld joint preparation with a narrow gap technique. This generally calls for a two-beads-per-layer sequence, along with the use of the submerged arc welding (SAW) process.

The standard practice recommended for high-pressure vessels with heavy wall thickness requires the implementation of weld joint preparation with a narrow gap technique. This generally calls for a two-beads-per-layer sequence, along with the use of the submerged arc welding (SAW) process. The SAW process provides a high-quality and uniform weld joint while reducing the residual stresses after welding. In refinery equipment that is subjected to high pressures and exposed to hydrogen (H2), high-strength materials, such as 2 ¼ Cr 1 Mo ¼ V, are commonly adopted. To remain at the forefront of welding technology, a research program has been launched to adopt a narrower weld joint, with respect to t

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