Joinining method and joining device

A joining method for joining joining elements to components, the method comprising the steps of:

• providing a joining element including a first joining surface, and providing a component including a second joining surface;
• preparing at least one of the first joining surface or the second joining surface, including the step of detecting the state of the at least one first joining surface or second joining surface using at least one of the following detection methods:
• (i) an electrical contact resistance measurement on the joining surface, (ii) an electrical conductivity measurement on the joining surface, (iii) a fluorescence measurement on the joining surface, and (iv) a laser measurement on the joining surface;
• and
• joining the joining element to the component.