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Can carbon steel be welded with laser welding machine?

We know that the Laser welding machine can weld a variety of metals, and the welding effect is very satisfactory. Can the laser welding machine weld carbon steel? The answer is of course yes, but  it is required to pay attention to the following points when welding carbon steel with laser welding machine:

1. When carbon steel is welded by laser welding machine, the carbon content (carbon equivalent) of the material should not exceed 0.2%. 
2. If the carbon equivalent exceeds 0.3%, the welding difficulty increases, the tendency of cold crack increases, and the brittle fracture tendency of the material under fatigue and low temperature conditions is also increased.
3. The joint design should consider certain shrinkage of the weld seam, it is beneficial to reduce the residual stress and crack tendency of the weld seam and heat affected zone.
4. When the material with carbon equivalent greater than 0.3% and the material with carbon equivalent less than 0.3% are welded together, the use of bias welding is beneficial to limit the transformation of martensite and reduce the occurrence of cracks.
5. Decreasing the quenching rate can also reduce the tendency of cracking.
In general, carbon steel laser welding has a good effect, and its welding quality depends on the impurity content. Like other welding processes, sulfur and phosphorus are sensitive factors of weld cracks. In order to obtain a satisfactory weld quality, preheating is required when the carbon content exceeds 0.25%. When steels with different carbon contents are welded to each other, the welding torch can be slightly biased to the side of the low carbon material to ensure joint quality. Low carbon killed steel has good welding effect due to its low impurity content. Medium and high carbon steels and common alloy steels can perform good laser welding, but require preheating and post-weld treatment to eliminate stress and avoid crack formation.

Shenzhen Sun Laser Technology Co., Ltd. is a high-tech enterprise integrating research, development, production, sales and service of laser equipment. The main products include: Laser marking machine series, laser welding machine series, laser cutting machine series. Shenzhen Sun Laser's equipment is widely used in mobile communication, electronic circuits, precision machinery, instrumentation, auto parts, lighting, jewelry, craft gifts, clothing, leather, aerospace and other fields.

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