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背景资料： 某城市热力管道工程，施工单位根据设计单位提供的平面控制网点和城市水准网点，按照支线、支干线、主干线的次序进行了施工定线测量后，用皮尺丈量定位固定支架、补偿器、阀门等的位置。 在热力管道实施焊接前，根据焊接工艺试验结果编写了焊接工艺方案，并按该工艺方案实施焊接，在焊接过程中，焊接纵向焊缝的端部采用定位焊，如果焊接温度在一10℃以下焊接时，先进行预热后焊接，焊缝部位的焊渣在焊缝未完全冷却之前经敲打而除去。在焊接质量检验过程中，发现有不合格的焊接部位，经过三次返修后达到质量要求标准。 问题： 1．施工单位在管线工程定线测量时有何不妥之处?并改正。 2．焊接工艺方案应包括哪些主要内容? 3．判断该施工单位在焊接过程中和焊接质量检验过程中存在哪些不妥之处?并改正。 4．热力管道焊接质量的检验次序是怎样的?
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