Combined Joining Processes

Combined joining processes are regularly used both in standard production and during repairs.

In the case of resistance-spot welding, all bonding surfaces and spot welds are replaced during repairs.

In this case, the unhardened adhesive must be displaced from the joint area by observing an appropriate hold-back time before actually starting resistance-spot welding.

In the case of two-component adhesives, the hardening reaction starts immediately after mixing and application; this increases the viscosity and so there is only a certain time window in which spot-weld bonding can be performed if the process is to be reliable.

For this reason, all time-intensive preliminary work (drilling, cutting to size, fixing etc.) on the parts to be joined must be performed before application of adhesive and joining.

This also applies to mechanical joining processes where the adhesive has to be displaced from the joint area, e.g. riveting.

Courtesy of PORSCHE CARS NORTH AMERICA, INC.

Separating body components

In the case of 3-layer spot-welded panel joints with a hardened bonded layer in which only the outer panel needs to be replaced, drill the outer panel in the area of the spotwelds sufficiently without damaging the spotweld and bonded joint in the second component layer.

Courtesy of PORSCHE CARS NORTH AMERICA, INC.

Separating body components

In the case of 3-layer spot-welded panel joints with a hardened bonded layer on the outer panel, drill the outer panel in the area of the spotwelds sufficiently without damaging the spotweld in the second component layer.