碳钢管线焊接接头的电化学腐蚀行为研究

摘要

母材选用 A106B 管线钢,焊丝选用2.4 mm 的实芯焊丝 ER70S-G，使用两种焊接工艺（GTAW+SMAW和GTAW）进行钢管对接焊，试样焊接前后均无热处理。通过对焊接接头的焊缝、热影响区和母材的极化曲线测量，研究了两种焊接工艺所得焊接接头各区域的腐蚀行为。结果表明，两种接头不同区域的耐蚀性为：母材＞热影响区＞焊缝。%In this article, it used two kinds of welding process (GTAW+SMAW and GTAW)to carry out butt welding for A106B pipeline steel, selecting 2.5 mm solid core welding wire of ER70S-G, without heat treatment for test sample before and after welding. Through polarization curve measurement for welded joint weld, HAZ and base metal, the corrosion behavior of welded joints various regions under two welding process were studied. The results showed that the corrosion resistance of two kinds of welded joints various regions are as follows:the base metal>HAZ>weld.