分别设计了适合对接和角接焊缝腐蚀检测的两种传感器。
Butt contact and angular contact welding seam corrosion detection sensors were designed respectively.
分析了甲醛生产中304不锈钢焊缝腐蚀的原因，并提出甲醛冷却器型式的选择。
The reasons that why the stainless steel welding line of 304 might be corroded in the production of formaldehyde were analyzed.
它们还必须能够区分是腐蚀、裂纹还是焊缝修复。
They also must distinguish between corrosion pits, cracks and welded machining repairs.
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