WELDING APPARATUS

PROBLEM TO BE SOLVED: To provide a welding apparatus and a welding method which can perform welding work without wasting the welding work by a welding robot even when the number of welding spots is odd.SOLUTION: A welding apparatus 1 includes: a first running unit 10 and a second running unit 20 moving along a first running rail 1L and a second running rail 2L respectively; a welding robot A30 installed on a first traverse beam 13 of the first running unit and a welding robot B30 installed on a second traverse beam 23 of the second running unit independently perform welding on the members to be welded W placed between both the rails. At the position where the first running unit and the second running unit come to face each other, a top end of the first traverse beam and a top end of the second traverse beam are formed not to contact each other in their length. The welding robot A30 is installed on one side of transversal frame that moves along the first traverse beam, while the welding robot B30 is installed on a transversal frame on the other side that moves along the second traverse beam.