In October 2023, the Yamashina welding bolts are made of metal materials that do not require heat treatment, which can save the cost of thermal management: improve quality. Due to the use of high-strength materials, poor processability, its manufacturing requires advanced technology. The features of this product are as follows: 1) Using high tensile strength materials 2) Use high-strength materials: the tensile strength is about 800Mpa. No heat treatment hardening of bolts 3) can achieve high-strength welding because the material carbon content is not high, so it has good weldability, can achieve safe, high-strength welding. The method of use is to weld it to the steel plate and erect it.