Numerical investigation on the laser impact welding process with dissimilar metallic joints

This report examines the laser impact welding (LIW) process of Ni-Al dissimilar metals, focusing on the formation mechanism of the joining via molecular dynamics (MD) simulation. The effects of impact depth, impact angle, and impact speed are examined. The results indicate that increasing the impact speed leads to better bonding quality, higher strain, stress, and structure transformation levels. At 1000 m/s to 2000 m/s, there are ejecting atoms that accumulate to form a cloud of particles and then become visible emission or jetting. The temperature evolution shows that some zone has a high temperature, leading to the local fusion welding state and facilitate the jetting effects. The displacement vector reveals the twisting atoms or vortex formation at the interface. The quality of the welding is significantly impacted by altering the impact angle. The atoms are well-intruded when impacting at 5° 10°, which leads to good interface bonding. To improve findings, additional research should be undertaken using different simulation methods or experiments in the future. • Increasing the impact speed leads to better bonding quality. • High temperature and elastic deformation facilitate the jetting effects. • There are twisting atoms or vortex formation at the interface. • Changing the impact angle could strongly affect the welding quality.