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大型钢结构工程其难度在于控制构件的焊接变形和整体几何尺寸的精度，结合牡丹江水泥集团石灰石预均化库工程的施工，介绍了３０榀大型门式刚架制作和合理的焊接工艺及焊接变形的纠正方法。
The difficulty of the large-scale steel structure project lies in the welding deformation of the control components and the accuracy of the overall geometric dimensions. In connection with the construction of the limestone pre-homogenization reservoir project of the Mudanjiang Cement Group, the production of 30-inch large-scale portal frame, reasonable welding process and welding deformation are introduced. The corrective method.