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The TA2/15CrNi3MoV clad plates were fabricated by explosive welding and then were heat-treated in the temperature range of 700-1000 ℃ for 30 min. Its microstructure and tensile strength were investigated and the results elucidated that the heat treatment process accelerated the interdiffusion of constituent elements (e.g., Fe, Ti and C) at the TA2/15CrNi3MoV interface, thus resulting in the formation of FeTi, Fe 2 Ti and TiC.For the samples heat-treated at 700 ℃, a continuous TiC layer was generated at the TA2/15CrNi3MoV interface, which hampered the formation of FeTi and Fe 2 Ti. However, for the samples heat-treated at 800 ℃, the continuous TiC layer was broken up, resulting in a signi cant increase in the Fe-Ti layer to 1.21 μm. This resulted in a dramatic drop in tensile strength to 329.2 MPa. For samples heat-treated in the temperature range of 900-1000 ℃, the thickness of the brittle Fe-Ti layer was increased dramatically, leading to a rapid drop in tensile strength.

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Twin-Wire Pulsed Tandem Gas Metal Arc Welding process with high welding production efficiency was used to join the girth weld seam of API X80 steel linepipe of 18.4 mm wall thickness and 1422 mm diameter. The macrostructure, microstructure, hardness, and electrochemical corrosion behavior of welded joints were studied. Effects of temperature and Cl − concentration on the corrosion behavior of base metal and weld metal were investigated. Results show that the welded joint has good morphology, mechanical properties, and corrosion resistance. The corrosion resistance of both the base metal and the weld metal decreases with increasing temperature or Cl − concentration. In the solution with high Cl − concentration, the base metal and weld metal are more susceptible to pitting. The corrosion resistance of the weld metal is slightly lower than that of the base metal.

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