By using Delaunay triangulation algorithm, triangulating with split-merge algorithm and the incremental insertion algorithm, improving the judgment that if the new inserted point meets the Delaunay triangulation "empty circle" criterion in synthesis algorithm, meanwhile, with the corresponding improvement of the LOP optimization algorithm, the design of weldment model in the virtual welding system has achieved good result.

In this paper the application of wavelet in data detection of dynamic testing is chiefly researched , i.e. , by applying the method of wavelet denoising to eliminate the non-stationary random noise which produced in data detection of dynamic testing , by analyzing dynamic testing data to define the optimal wavelet as well as the optimal decomposition scale. Based on actual requirements of dynamic testing system, to reconstruct the data accurately by using FIR filter with biorthogonal wavelet, the method has a favorable effect.

By using inverse grating technology, improving the design of data input module in virtual welding system. We analyzed and accomplished the method of data input, taking into account the weldment needs to make a dynamic changes in the welding process, we design the static and dynamic data input modules. Through running some instances of the program, we have proved that, with the corresponding improvement of the inverse grating technology, the design of data input module in the virtual welding system has achieved good result.