Laser wire filling and butt welding method for titanium-steel composite plate with T2 red copper serving as transition layer

Abstract

The invention discloses a laser wire filling and butt welding method for a titanium-steel composite plate with T2 red copper serving as a transition layer. The method comprises the following steps: (1) machining two titanium-steel composite plates to be subjected to butt welding; (2) butting and assembling the two titanium-steel composite plates to be subjected to butt welding; (3) performing laser backing welding on a gap between titanium plates of the two titanium-steel composite plates to be subjected to butt welding to form a laser backing welding line; (4) covering the lower surface of the laser backing welding line with titanium welding wires by adopting laser wire filling welding to form a titanium wire welding line, and overlaying a layer of T2 red copper at the bottom of a V-shaped groove to form a transition layer welding line; (5) overlaying a first layer of steel welding bead on the upper surface of the transition layer welding line; and (6) overlaying a second layer of steel welding bead on the upper surface of the first layer of steel welding bead by adopting the laser wire filling method. According to the method, the problems of high welding heat stress and serious mismatch of heat stress between metal layers due to the formation of brittle intermetallic compounds in the butt welding process of the titanium-steel composite plate can be effectively solved.

Description

technical field [0001] The invention belongs to the field of welding technology and relates to a laser wire-filled butt welding method for a titanium-steel composite plate with T2 red copper as a transition layer. Background technique [0002] Titanium is widely used in many industrial fields because of its high specific strength, good corrosion resistance, good wear resistance, and good high and low temperature performance. However, because titanium is a rare metal and its price is high, its use is largely limited. App promotion. Steel has good comprehensive mechanical properties, good weldability, good thermal stability, and its price is low, so it is the most widely used metal structure material. However, steel has poor corrosion resistance and is also dense. Titanium-steel composite plate is a bimetallic plate composite material formed by layering and combining titanium plate and steel plate by explosive welding and other means. The titanium-steel composite plate can ...

AI Technical Summary

Problems solved by technology

After welding, a large number of cracks and defects were found in the joint: V / Ti interface has incomplete penetration defects; Cu / V and CP-Ti / Q345 / V have a large number of cracks; CP-Ti / Q345 / V bonding interface can be observed TiFe brittle phase

The results show that a certain amount of brittle phases are generated in both TiNi welds and NiCrMo welds, which lead to lower joint strength and ductility

Images