钢结构工程项目施工质量问题的复杂性，主要表现在引发质量问题的因素繁多，产生质量问题的原因也复杂，即使是同一性质的质量问题，原因有时也不一样，从而质量问题的分析、判断和处理增加了复杂性。例如焊接裂缝，其既可发生在焊缝金属中，也可发生在母材热影响中，既可在焊缝表面，也可在焊缝内部；裂缝走向既可平行于焊道，也可垂直于焊道，裂缝既可能是冷裂缝，也可能是热裂缝；产生原因也有焊接材料选用不当和焊接预热或扭王块模具 高铁遮板模具 阶梯护坡模具 拱形护坡模具 卵形槽模具 保定室内设计培训 保定平面设计培训后热不当之分。
The complexity of construction quality problems in steel structure engineering projects is mainly manifested in the various factors causing quality problems, and the causes of quality problems are also complex. Even the quality problems of the same nature sometimes have different causes, so the analysis, judgment and treatment of quality problems increase the complexity. For example, welding cracks can occur either in weld metal or in heat effect of base metal, either on weld surface or inside the weld; the direction of cracks can be parallel to or perpendicular to the weld path; cracks can be either cold or hot cracks; the causes are also the improper selection of welding materials. It can be distinguished from improper preheating or post-heating of welding