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前言用手工电弧焊焊接低合金高强度钢时,焊缝及热影响区中氢的主要来源是焊条药皮所含的水分。为降低含氢量、预防冷裂缝,低合金高强度钢焊接时,均需采用低氢焊条。为了保证低氢焊条的工艺性能和焊接件的质量,必须严格控制焊条的潜在含氢量或者药皮的总含水量。钢种不同,所用焊条总含水量的控制范围也不同。目前,用于衡量焊条药皮潜在含氢量与总含水量的指标,通常是焊缝金属扩散氢的含量。常用的测定方法是甘油法。甘油法测氢时,其测量结果受测试技术、操作条件,以及焊接参数
Preface When using hand-arc welding of low-alloy high-strength steel, the main source of hydrogen in the weld and heat-affected zone is the moisture contained in the electrode coating. To reduce the hydrogen content, to prevent cold cracks, low-alloy high-strength steel welding, are required to use low-hydrogen electrode. In order to ensure the process performance of low hydrogen electrode and the quality of the welded parts, the potential hydrogen content of the welding rod or the total moisture content of the coating must be strictly controlled. Different types of steel, welding rod total water content of the control range is different. At present, the index used to measure the potential hydrogen content and total water content of electrode coatings is usually the content of hydrogen diffused by the weld metal. The commonly used method of determination is the glycerol method. Glycerol method of measuring hydrogen, the measurement results by the test techniques, operating conditions, and welding parameters