Fiber laser-assisted TIG welding weld characteristics and in fluencing factors

On the base of active welding method, laser aided activating TIG welding was proposed. At first, the surface of weld was melted by the mini power laser protected by oxygen.Then the conventional TIG was used to cover the weld, which achieved the target of the weld with deeper penetration and narrower width. The results show that with the increase of welding current, the penetration and width of weld melted and unmelted by laser increased, but the penetration of weld melted increased faster. The increase of welding speed led to decrease of penetration and width. With increase of power laser, the penetration increased, but width decreased. With the increase of pre-melting speed, the penetration increased first and then decreased, the width decreased and then increased. The weld, its penetration increased significantly and appearance was good, was gained by optimum parameters. Thus laser aided activating TIG welding was developed as a novel active welding method.