one,Guangdong carbon steel castingProblems Easily Occurred in Welding of Carbon Steel and Countermeasures of Processing Technology

The following problems are likely to occur when Guangdong carbon steel is cast and welded to medium carbon steel:

1, Cold crack problem

Because the carbon content of the stainless steel plate is relatively high, the heat-hazard zone is prone to cause hard and brittle martensite structure during welding, which is prone to cause cold cracks. If the welding raw materials are poorly used or the welding process is not well formulated, the welding seam is also easy to cause cold cracks.

2, Hot crack problem

During welding, after the base metal with higher carbon content is melted, the carbon will also be brought into the weld, which will increase the carbon content in the welding. Carbon can increase the effect of sulfur and phosphorus in metal materials to cause hot cracks, so the weld is prone to hot cracks when welding medium carbon steel. Guangdong carbon steel foundry Cheng Mao told us that especially when the content of sulfur and phosphorus in the base metal or welding raw materials is not controlled properly, it is more likely to cause hot cracks.

In addition, the high content of carbon in steel also causes welding seams to causeCOThe vent tends to expand.

Guangdong carbon steel forging process countermeasures

Because of the shortcomings of cold cracks, hot cracks and other shortcomings caused by casting and welding of carbon steel in Guangdong, some unique processing techniques must be adopted for welding to be able to weld without problems.

1, Welding method

Various arc welding methods can be used to weld medium carbon steel. Because medium carbon steel is mostly used to produce equipment parts, it is not a large and medium-sized welding structure, so Arc welding is the most used in manufacturing.

2, Welding raw materials

In order to better avoid Welding joints cause cold cracks and hot cracks, and low-hydrogen wire welding is generally used for arc welding. Low hydrogen welding wire not only lowers the hydrogen content in the weld, but also has a certain desulfurization and phosphorus effect, which can improve Plastic deformation and toughness of the weld. When the carbon content in the steel is low and the degree of restraint of the connector is not large, ilmenite type or titanium calcium type welding wire can also be used for welding, but strict processing techniques must be adopted to cooperate with each other.