在1954年以前,我们承制的金属结构工程主要是铆接结构,焊接所占的比重很少。在1954年承制某重点工程金属结构,全部是国外设计的焊接结构,不仅结构庞大,技术复杂,而质量要求也极为严格。在以焊代铆的技术转变过程中,遇到了很多技术问题,特别严重的是焊件焊后变形问题。大型结 Before 1954, the metal structures we undertook were mainly riveted structures, with a small proportion of welding. In 1954 to undertake a key project of the metal structure, all of the foreign design of the welding structure, not only the structure of large, complex technology, and the quality requirements are extremely strict. In the process of welding and riveting technology has encountered a lot of technical problems, particularly serious welding deformation after welding. Large knot