Same-direction forming mode based forming morphology control method for GMAW material increase manufacturing

The invention provides a same-direction forming mode based forming morphology control method for GMAW material increase manufacturing. The control method includes the steps that arc starting and quenching movement I/O control and given electric signal D/A control of forming current and voltage are completed in the GMAW material increase manufacturing process, and when the forming process is close to the arc quenching end, the forming current, forming speed and forming voltage are gradually decreased within the length range of the arc quenching end; a GMAW welding gun is increased for one layer height and is controlled to return to the forming arc starting end; the upper surface temperature of a formed part is reduced to be 20-300 DEG C; forming of a residual layer is completed till the forming size of the whole structural part meets the requirements. The same-direction forming mode based forming morphology control method can effectively inhibit the height size difference produced by the part end in the same-direction forming process, decreases the defects produced in the forming process, ensures that higher forming size precision is obtained in GMAW material increase manufacturing in the same-direction forming mode and provides a reliable technical support for forming quality control of GMAW material increase manufacturing.