Welding of high carbon steel Due to its high carbon content, high carbon steel has poor welding performance. Its welding has the following characteristics:
(1) Poor thermal conductivity, a significant temperature difference occurs between the welding area and the unheated part. When the molten pool cools rapidly, the internal stress caused in the weld can easily form cracks.
(2) It is more sensitive to quenching, and martensitic structure is very easy to form in the near-seam area. Due to the effect of tissue stress, cold cracks occur in the near-seam area.
(3) Due to the influence of high welding temperature, grain growth is fast, and carbides easily accumulate and grow on the grain boundaries, making the weld fragile and reducing the strength of the weld joint.
(4) High carbon steel is more likely to produce thermal cracks than medium carbon steel during welding.