问题：
[问答题]
背景:某机电安装公司，通过竞标承担了某化工厂的设备、管道安装工程。为兑现投标承诺，该公司通过质量策划，编制了施工组织设计和相应的施工方案，并建立了现场质量保证体系，制定了检验试验卡，要求严格执行三检制。工程进入后期，为赶工期，采用晚间加班的办法加快管道施工进度，由此也造成了质量与进度的矛盾。质量检查员在管道施工质量检查时，通过无损检测等对不锈钢管的焊接质量进行判断检查，发现部分不锈钢管焊口内在质量不合格，同时钢管焊接变形过大，整条管成一折线状，不得不拆除重新组对焊接，造成直接经济损失56000元。
参考答案：
解析：
影响施工质量的因素有人、机(包括检验器具)、料、法、环五大因素;造成本案例不锈钢管焊接变形过大的主要因素是人。
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