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This paper studied the effect of laser welding technology on dissimilar metal welding joints of TA15 titanium alloy and Inconel 718 nickel-based alloy. The research results indicate that the laser welding of TA15 titanium alloy and Inconel 718 nickel-based alloy directly was difficult to form well, which due to the intermetallic compounds caused the joint brittle. When the pure Cu foil was used as the filling layer, the quality of the welding joints can be improved effectively. The experimental results also indicate that there were brittle intermetallic-compounds in the laser welding seam, and the laser power had an important influence on the performance and mechanical properties of the dissimilar metal joint. The maximum average tensile strength of the welding joint of2300 W was increased to 252.32 MPa. Scanning electron microscope(SEM) results show that the fracture morphology was river pattern, a typical morphological of cleavage fracture, and the mode was brittle fracture. [ABSTRACT FROM AUTHOR] more...

Argon-shielded twin-wire indirect arc (TWIA) welding is a method with a high melting rate, high welding efficiency, low welding deformation and low penetration depth of the weld joint. In this paper, the arc behavior of the twin-wire indirect arc (TWIA) for current values of 100 A, 150 A and 200 A and their influence on the welding process were discussed, and the reasons of the previously mentioned advantages of this welding method were analyzed. The plasma temperature was measured to verify the correctness of the simulation. The results indicate that the arc behavior is mainly controlled by the welding current. With the increasing current, the arc parameters in the anode and cathode regions significantly increase, whereas those in the arc column region vary by a smaller degree. The rate of increase of the arc parameters in the entire arc region is smaller than that of the welding current. The isotherm shifts toward the anode side and the shift of the isotherm increases when the welding current increases. The advantaged of TWIA welding was discussed according to the calculated result. [ABSTRACT FROM AUTHOR] more...