研究目的
Investigating porosity and solidification cracking in deep penetration keyhole laser-arc hybrid welding (LAHW) of 45 mm thick high strength steel.
研究成果
Laser-arc hybrid welding is susceptible to porosity and solidification cracking in deep penetration welding due to high depth-to-width ratio. Porosity increases with welding speed and air gap. Solidification cracking is mainly located in the root at the weld centerline. Lower welding speed and larger laser spot diameter may mitigate cracking. Numerical simulations showed high cooling rates and stresses in the root area, correlating with cracking tendency.
研究不足
The study is limited to specific welding parameters and materials. The range of process parameters might be too narrow to identify conditions for crack-free welds. The applicability of porosity suppression mechanisms is limited to certain cases.
1：Experimental Design and Method Selection:
The study used a double-sided welding technique with a fiber laser-MAG process to join 45 mm thick high strength steel plates. The methodology included high-speed imaging and numerical simulations to analyze keyhole dynamics and stress fields.
2：Sample Selection and Data Sources:
The samples were 45 mm thick high strength steel plates. Data was collected through X-ray photography, ultrasonic inspection, and destructive testing.
3：List of Experimental Equipment and Materials:
A 15 kW ytterbium fiber laser, Fronius TPS4000 VMT Remote GMAW power source, and a Motoman articulated robot were used. Materials included a microalloyed high strength steel and a 1.2 mm metal-cored filler wire.
4：2 mm metal-cored filler wire.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The welding process was observed using a high-speed imaging camera. The welds were subjected to non-destructive and destructive testing to assess porosity and cracking.
5：Data Analysis Methods:
Numerical simulations using ABAQUS with a subroutine DFLUX for moving heat sources were performed to analyze thermal and stress fields.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
