Programmed TIG welding method based on welder's senses is applicable to the automatic welding of the aluminum alloy for which the heat-input control is indispensable. However, it is necessary to set the aimpointofelectrode,thelengthofweldingarcandtheangleofweldingtorchwithhighaccuracyinorder to obtain the superior welding results. For this reason, it is difficult to apply the programmed TIG welding method when welding is performed on the joint needed complicated torch operation. This report proposes the welding method that the welder cooperates with the programmed TIG welding method to expand its applicable scope and refers to the cruciform joint welding of aluminum alloy pipe and the butt welding of thejoint composed of aluminum alloy sheet and Hot-dip galvanized steel sheet. As a result, the welder conducted the operation method of the electrode and filler metal, which had made it possible to carry out the programmed TIG welding for the above two weld joints and to provide proper weld bead with high reproducibility.
Friction spot welding (FSJ) process is very complicated in the aspects of material flow, heat generation and joining mechanism. Compared with friction stir welding (FSW) process for butt joint, FSJ process is used to join two pieces of plate in the direction of thickness. Although there are several papers describing simulation models for FSW process, we can not find any papers relating to simulation models for FSJ process. In order to simulate FSJ process efficiently, an axis-symmetric two dimensional FEM model with adaptive re-meshing algorism is proposed. By using the proposed model, temperature distribution, joining shape of the transverse section including toe flash on the surface and hook on the joining interface, can be simulated. The simulated results are well agreed with those of experiment. Furthermore, effects of clamp position and stirring direction on material flow and joining shape are investigated.