Force is complex and not qualitative a great wind tower structure, the main weld (wind towers cylinder longitudinal, vertical circular seam the flange ring sewn) performance must be the same as the base metal. That the tensile strength of the Welding Assembly and -40 ° C low temperature notched impact value shall not be less than the lowest value of the standard requirements of the base metal. -10 ℃ CTOD values ??must also meet the requirements of the corresponding manufacturing regulations.
The strength and notched impact toughness of welded joints depends on many factors, mainly including Welding Material, welding processes, welding heat input, preheat temperature, the highest level between temperature and post-weld heat treatment. Therefore, for the wind towers master cylinder weld before welding production EN288-3 standard welding procedure qualification, to verify whether the performance of welded joints to meet the requirements.