HIGH FREQUENCY ELECTRIC RESISTANCE WELDING METHOD

摘要

PURPOSE: A high-frequency electric resistance welding method is provided to improve welding quality by controlling the periodicity of a narrow gap. CONSTITUTION: A high-frequency electric resistance welding method is as follows. Welding power for welding a pipe forming material is set(S12). A power control reference and supplied first power for controlling the level of output power are inputted(S16). The supplied first power is measured(S22). An electric transformer, which receives the first power, computes output power that is second power(S24). A power control reference is changed by comparing the output power with set welding power(S40).