阴APP导航

Due to rising resource savings, today`s applications in mechanical engineering require especially light weight constructions, which can be transacted in a multi-material-design. In doing so, a great challenge is given by the joining of steel with other materials like fiber-reinforced plastics or concrete. Therefore, by using a new existing welding method of Fronius International GmbH, small-scale pin structures can be welded on steel-sheets, so that the corresponding joining material can be added in a positive fit around the welded pin-structure.

The pin-welding-process is a gas-metal-arc welding-process based on a short-arc process, characterized by a forward and backward movement of the welding wire in a high frequency during the welding, mainly developed to reduce the energy input into the base material. In this process, the wire is mechanically pulled out of the weld pool after detecting a voltage drop and simultaneously the short circuit current is reduced to a certain set value. By a following current pulse, the welding wire is welded on the base material. After a slight time shift, the wire is cut off by a further current pulse. For the first time, small-scale pins can be formed directly out of the welding wire in a substance-to-substance bond to the base material in one step.

By the behavior of welding current and voltage to the time, different pin formations are possible. At the present time, pins can be reproducible welded up to a height of about 5 mm with different diameters on austenitic stainless and structural steels with corresponding welding wires. Due to a fast welding time, the process gives advantages and opens new possibilities for the welding and construction industry for joining different materials.