Competency in spot welding
"Most of what you can see of a Volvo comes from Olofström," explains Leif Winberg, the plant engineer in charge of resistance welding in the Volvo Olofström factory. This includes load-bearing components like the A, B and C columns, the bumper reinforcement, the front side members, the side impact beams, the cross beams and the roof arch and roof rail, together with doors and frames. All these components are produced in different versions for the various Volvo models, ranging from the compact V40 through to the S60 saloons and the large SUV, the XC90.
A key element in bodywork production is resistance welding, since correctly welded sheet metal components play a crucial role in the passive safety of a vehicle. Within the welding process, there is great potential for increased productivity in the milling of electrodes. Welding gun electrodes become blunter as they are being used and have to be milled after approximately 150 spot welds to ensure the spot welding is perfectly accurate. "Electrode milling operates on the same principle as the sharpening of a blunt pencil," explains welding expert Winberg.