A weld system has a positioning welding module 7 comprising a material positioning device 3 and a welding device 5 capable of welding material pieces W1 and W3 positioned by the material positioning device 3, a material module 11 for stocking the material pieces W1 and W3 to be supplied to the positioning welding module 7, and a product module 15 for stocking products W5 welded at the positioning welding module 7.
