Two-Phase Welding for CVT Steel Carrier Ring Surface Quality

The continuous welding process is segmented into two distinct phases: a first welding phase that creates an initial weld, and a second welding phase that creates an overlapping weld. This segmentation allows each phase to perform a specific function - the first phase establishes the basic weld structure while the second phase repairs and improves the surface quality by overlapping the previous weld, thereby eliminating uneven indentations and surface defects.

The first welding phase performs a preliminary welding action that creates an initial weld structure. This preliminary weld, while functional, contains surface imperfections. The second welding phase then acts as a corrective action, overlapping the first weld to repair the surface defects. This preliminary action followed by corrective action resolves the contradiction by maintaining welding efficiency while improving surface quality.

The welding process is divided into two phases with different intensity characteristics. The first phase uses sufficient welding intensity to achieve complete fusion and establish strong weld metal structure. The second phase uses overlapping welds to redistribute and reduce the surface tension effects that cause indentation, while maintaining the structural strength achieved in the first phase.

The second welding phase converts the harmful effect of surface tension-induced indentation into a beneficial outcome. By applying an overlapping weld over the first weld, the process intentionally creates a second melt pool that, upon solidification, fills and smooths the indentation caused by the first weld's surface tension effects. This transforms the harmful indentation into a benefit of enhanced surface quality while maintaining weld strength.