WELDING METHOD

PROBLEM TO BE SOLVED: To provide a welding method which can lessen the waste of welding work of a welding robot, irrespective of the number of welding portions in regard to the number of welding robots constituting a system.SOLUTION: In a welding method S, a plurality of weled members W is arranged between a first traveling rail 1L and a second taveling rail 2L which are in parallel, a welding robot A30 mounted on a first traveling body 10 traveling on the first traveling rail and a welding robot B30 mounted on a second traveling body 20 traveling on the second traveling rail perform welding, previously setting welding portions in charge about the welded members, wherein a welding method S executes repeatedly a moving process S4 (S10 etc.), a welding process S7 (S13 etc.), and a determination process S8 (SW14 etc.), until the welding portions of the arranged plurality of welding members is welded. Then, in the welding method S, the moving process is made to be a procedure where the first traveling body and the second traveling body are moved by the presence and the non-presence of the completion of the welded portion in charge, in the determination process.