长输管道全位置激光-电弧复合焊接技术

采用激光-电弧复合焊接技术开展管道的全位置激光-电弧复合焊接可行性研究．结果表明，激光-电弧复合焊接工艺能够适应管道环焊缝焊接的要求．在从0°～180°的焊接过程中，通过调整焊接参数，均能够获得成形良好的焊缝．金相观察表明，母材和焊材熔合良好；焊接接头中心区狭长，具有激光焊的特点；热影响区具有电弧焊的特点；金相组织不受位置影响．焊接接头的硬度接近母材，抗拉强度接近或超过母材；在无内部缺陷的情况下，弯曲试验和冲击试验结果满足现行标准要求．

Research on all-position laser-arc hybrid welding for long-distance transportation pipeline

Using laser-arc hybrid welding method to weld pipeline butt will improve the efficiency of pipeline construction.The feasibility of welding pipeline butt by laser-arc hybrid welding process was discussed through experiments.Experiment results showed that hybrid welding meet the requirements for girth welding.From 0 to 180 degree, by using different parameters union, the welding joint is satisfactory.Metallographic image showed the base material and welding material fused soundly, the cross section of welding seam was as narrow as that of the laser welding, and the heat affected zone was of the same characteristic of arc welding.Metallurgical structure is not affected by position variation.The hardness value and tensile strength of welding seam is close to or exceed that of the base material.The result of bending test and impact test are qualified in the case that there are no internal defects.