Microstructure and mechanical properties of S355J2W weathering steel welded joint

The microstructure and mechanical properties of S355J2W weathering steel, air-cooled welded joint and annealed welded joint were studied by tensile, fatigue and metallographic tests.

The results show that the mechanical properties of the welded joints of S355J2W in annealing state meet the requirements, and the strength of the welded joints of S355J2W weathering steel in air cooling state is lower than that of the welded joints of S355J2W weathering steel in annealing state. The plasticity of welded joints in annealing state is better than that in air cooling state.

The fatigue life of S355J2W weathering steel welded joints in annealed state is lower than that in air-cooled state. Compared with the air-cooled joint, the grains in each region of the annealed joint are obviously refined and homogenized, and the grain boundaries of the air-cooled joint are clear.

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