the welding of valley rafter steel is a splice. welding of galvanized steel roof structures

iron roof wood wing vehicle bumper floor wheel window wall handrail mast line stairs ceiling beam flooring welding steel structures perform spot weld temporary joint arc fusion process used join metals electric power supply creates intense heat 6500°f melts metal two work pieces architecture building sky structure construction pattern design business industry city frame blue urban dome triangle tower office column plate top pole post base galvanized valley rafter splice