该数据集主要对20mm厚度规格Q690NHH气保焊焊缝进行进行化学成分检测，通过对材料中的C、Si、Mn、P、S、Cr、Ni、Cu、Nb、V、Ti、Mo、Al等元素的化学成分分析，确定不同成分工艺的材料对实际力学性能的影响，为焊接材料设计方案提供依据。

This data set mainly conducts chemical composition testing for Q690NHH gas shielded welding seams of 20mm thickness specification, through the C, Si, Mn, P, S, Cr, Ni, Cu, Nb, V, Ti, Mo, Al in the material The chemical composition analysis of other elements determines the influence of materials of different composition processes on the actual mechanical properties, and provides a basis for the design of welding materials.