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本文主要针对大型低合金钢龙门吊车横梁合拢焊缝极易产生裂纹和变形的特点，通过实施合理的焊接工艺以及严格的检验措施，使焊缝质量和横梁的尺寸精度均达到了设计要求。
This paper mainly aims at the characteristics of cracks and deformation of the cross-beam close-up welds of large low-alloy steel gantry cranes. The welding quality and the dimensional accuracy of the beams meet the design requirements by implementing reasonable welding process and strict inspection measures.