Evaluating the integrity of the welded pipes used for fluid transportation in processing industries demands certain investigations on the erosion and corrosion behavior under various environmental conditions. ASTM A106 Grade-B pipes are butt welded using an automated MIG welding setup to obtain the optimum output response such as Reinforcement Form Factor (W1), Penetration Shape Factor (W2), and Tensile Strength (W3) in the weldments. The slurry erosion test is conducted on the weldment surface by varying the velocity and erodent concentration in acidic (0.1M H₂SO4) and alkaline (3.5%wt. NaCl) conditions. Correspondingly, the samples are subjected to electrochemical corrosion test in 0.1M H₂SO₄ and 3.5% wt. NaCl solutions. The SEM investigations carried out on the eroded weldment surface show glimpses of erosion mechanisms such as shallow and deep ploughing, oxide cracks, ridges and valleys, scale formation at some areas attributing to sulphide deposition. The corrosion that occurred on the weldment surface tested under acidic conditions is relatively high compared to the alkaline conditions. The reinforcement form factor is the most preferable weld bead characteristic to obtain better erosion and corrosion resistant weldments in the investigated pipe material.

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MIG焊接工艺参数对ASTM A106 B级管焊件冲蚀和腐蚀行为的影响

评估加工工业中用于流体输送的焊管的完整性需要对各种环境条件下的侵蚀和腐蚀行为进行一定的调查。ASTM A106 B 级管道使用自动 MIG 焊接装置对焊，以获得最佳输出响应，例如焊件中的钢筋形状系数 (W1)、穿透形状系数 (W2) 和拉伸强度 (W3)。通过改变酸性（0.1MH ₂ SO4)和碱性（3.5%重量。NaCl) 条件。相应地，对样品进行 0.1 的电化学腐蚀试验MH ₂ SO ₄和 3.5% wt. 氯化钠溶液。对腐蚀焊件表面进行的 SEM 研究显示了腐蚀机制的一瞥，例如浅耕和深耕、氧化物裂纹、脊和谷、在某些区域形成了归因于硫化物沉积的氧化皮。与碱性条件相比，在酸性条件下测试的焊件表面发生的腐蚀相对较高。增强形状因子是最优选的焊道特性，可在所研究的管道材料中获得更好的耐侵蚀和耐腐蚀焊件。