Welding current is transferred to the wire through the contact tip whose bore is slightly greater than the wire diameter.
焊接电流通过孔径稍大于焊丝直径的接触端传送到焊丝。
2
If a current with proper intensity has been switched on, the goal of controlling the melting and welding dimension effectively around the crack tip can be obtained.
文中给出的算例表明，适当控制通入的电流强度，可以达到有效控制裂尖熔化区尺寸以及形成焊口的目的。
3
The blade tip crack of the high pressure turbine is repaired by using the laser welding, which can reduce effectively the repair cost and increase the economic effectiveness of the engine repair.