Poor welding preheating before welding, should be.
焊接性差，焊前应预热。
The analysis of the corrosion form and environment confirms that the main cause of the corrosion is the poor welding quality and water permeation.
通过对腐蚀形貌和环境进行分析，确认罐顶焊接质量差和雨水渗入是造成腐蚀的主要原因。
Comprehensive analysis shows that the welding rod material has poor welding performance, if the cooling rate after welding is too rapid, then the welding stress can be too large.
综合分析表明，拉杆材料焊接性能差，焊后冷却速度过快，以致焊接应力过大。
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