复杂闭口截面冷弯型钢的成型及焊接工艺设计

闭口截面冷弯型钢与开口截面冷弯型钢相比，截面形状复杂且一般不对称，因而在焊接质量控制、尺寸控制以及成型设备等方面都存在很大的不同。以50钢门框型材产品设计为例，介绍了复杂封闭截面型钢常用的成型方式和焊接方式，分析了成型工艺对其焊接质量的影响，提出了在制定成型工艺时应注意的事项。实际生产证明，选用的50钢门框型材的成型工艺和焊接工艺合理可靠，成型和焊接质量稳定。

Forming and Welding Procedure Designs of Cold-bend Forming with Complex Closed Section

Comparing cold-bend forming with closed section with cold-bend forming with opened section,the section profile is complex and dissymmetry,so there are major difference in welding quality control,dimension control and forming equipment.This article introduced forming and welding modes used for forming with closed section taking 50# steel door-frame type products for example,analyzed forming procedure effecting on welding quality,put forward notice items when set up forming procedure.Production practice proved forming and welding procedure of 50# steel door-frame type is feasible,forming and welding quality are stable.