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首頁 > 鋼管百科 > 螺旋鋼管焊接區常見缺陷

螺旋鋼管焊接區常見缺陷

日期:2020-08-07
螺旋鋼管

1.氣泡

氣泡多半出現在焊縫的中心。氫仍然以氣泡的形式隱藏在焊縫金屬中。主要原因是焊絲和焊劑表面有水分。它們無需干燥即可直接使用,并且在焊接過程中電流相對較高。如果焊接速度太快,加速凝固的金屬也會發生。

2.底切

底切是沿著焊接中心線在焊接邊緣處的V形凹槽。主要原因是焊接速度,電流,電壓和其他條件不合適。焊接速度比電流過高不合適。容易引起咬邊缺陷。

3.熱裂

熱裂紋的原因是當焊縫的應力很高時,或者當焊縫金屬中的SI硅元素很高時,也會發生硫裂紋。毛坯是具有很強的硫偏析區(屬于軟沸騰鋼)的板材,在焊接過程中,硫化物進入焊接金屬并產生裂紋。

4.滲透不足

內部和外部焊縫金屬之間的重疊不夠,有時焊縫無法穿透。

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