Three Things You Must Know Before Welding S35C Steel Plate

S35C steel plate, classified under JIS G 4051, is a medium carbon steel known for its strength and versatility. However, its higher carbon content means it can be prone to cracking during welding if proper precautions are not taken. Before welding S35C steel, here are three crucial things you must know:

1. Preheating is essential.
Due to the carbon content, S35C steel plate is susceptible to cold cracking. Preheating the material to around 150–250°C before welding helps reduce thermal stress and improves weld quality. The preheat temperature can vary depending on the plate thickness and complexity of the weld.

2. Use low-hydrogen consumables.
To minimize the risk of hydrogen-induced cracking, always select low-hydrogen electrodes or filler wires that are compatible with medium carbon steel. Keeping electrodes dry and following proper storage practices is also important.

3. Consider post-weld heat treatment.
Post-weld heat treatment (PWHT) helps relieve residual stress and restores ductility in the welded area. This is especially important for parts subjected to cyclic loading or requiring high reliability.

Understanding and applying these practices can greatly improve the weldability and long-term performance of your S35C steel plate components, ensuring strength, safety, and efficiency in your final product.