六角钢材料为45#，此材料淬火后焊接性较差，为了保证焊接处有良好的焊接

The hexagonal steel material is 45#, which has poor weldability after quenching. In order to ensure good weldability at the weld, the welding end of the hexagonal bar cannot be quenched, so only the local intermediate frequency quenching process can be selected, and the surface hardness is HRC40±3. The depth of the hardened layer is 1.5mm±0.5. When quenching the hexagonal bar, the center holes at both ends need to be used for positioning. If allowed, the center holes at both ends are reserved. Cut to remove.

The material of hexagonal angle steel is 45#, which has poor weldability after quenching. In order to ensure good weldability of the welding position, the welding end of hexagonal bar cannot be quenched, so only local medium frequency quenching process can be selected, with surface hardness of hrc40 ± 3 and hardened layer depth of 1.5mm ± 0.5. When medium frequency quenching is carried out on hexagonal bar, center holes at both ends need to be used for positioning, if allowed, The center holes at both ends are retained. If not allowed, the center hole can be removed by wire cutting.

Hexagon angle steel material is 45#, and the weldability of this material is poor after quenching. In order to ensure the good weldability of the welded joint, the welded end of the hexagonal bar can not be quenched, so we can only choose the local intermediate frequency quenching process, with the surface hardness of HRC40±3 and the hardened layer depth of 1.5mm±0.5. When the hexagonal bar is quenched by intermediate frequency, the central holes at both ends need to be positioned. If allowed, the central holes at both ends will remain; if not allowed.