Comparative analysis of GTAW+SMAW and GTAW welded joints of duplex stainless steel 2205 pipe

Stainless steel clad plates have been gradually applied in the areas required for both good mechanical properties and corrosion resistance effects, but welding technology is still playing a limiting role in its further large-scale application. The aim of this paper is to review the welding status and future prospective of stainless steel clad plates so as to offer a basis for following research. The paper carefully discussed the welding issues of stainless steel clad plates from three aspects of conventional multi-layer and multi-pass welding, high efficiency welding, and welding finite element simulation, respectively. And simultaneously, the relevant future works were planned too.

A brief review on welding of stainless steel clad plates: issues and future perspectives

Numerical simulation of residual stress in post internal-welding process of bimetal composite pipe and optimization of welding sequence

Microstructure and properties of laser cladding coating at the end of L415/316L bimetal composite pipe

The butt welding of bimetal composite pipes generally adopts single-side welding, which easily gives rise to the problems such as high cost or crack initiation. In this paper, the butt welding of L415/316L bimetal mechanical lined pipes was conducted using post-internal-welding process, which is double-side welding process, proposed by the authors. Firstly, the effect of groove shape on the weld process was discussed. Then, microstructures and mechanical and corrosion-resistance properties of welded joints welded using two different welding materials, 309MoL and 309L, were investigated. The results show that the most suitable groove is that L415 is V shape with angle of 60° and blunt edge of 1 mm and 316L is stripped 6–8 mm. The weld of both 309MoL and 309L is composed of austenite and a small amount of ferrite, but the presence of Mo can refine the grains and increase the content of ferrite phase. The width of transition layer is about 0.6–0.8 mm located at the weld junction of stainless steel weld and carbon steel weld, and the transition layer mainly contains martensite. The tensile and bending performances of the welded joints using both 309MoL and 309L do meet the standard requirements. The welding wire 309MoL can improve the corrosion resistance to Cl− compared to 309L. It is advisable to use the post-internal-welding process and 309MoL for the welding of bimetal composite pipes under environments containing Cl−.

Xiaolei Wang

Papers

Welding L415/316L Bimetal Composite Pipe Using Post-Internal-Welding Process