在4 mm厚不锈钢激光-电弧双面焊接试验的基础上，研究了激光功率、电弧电流对接头形貌特征和接头特征量的影响规律，并对熔化效率进行了分析。结果表明，在较小的能量匹配下，双面焊接头呈现出激光焊与电弧焊的混合特征，随着热输入的增大，混合特征消失；增大激光功率，可使激光侧焊缝熔宽增加，而电弧侧焊缝熔宽减小，增加电弧电流，可使电弧侧焊缝熔宽增加，而对激光侧焊缝影响很小；激光功率和电弧电流增加都对焊缝中部最小熔宽有明显的增加；中部最小熔宽的深度随激光功率增加而增加，而电弧电流则起到相反的作用。在非熔透条件下，激光对电弧焊的熔化效率影响很明显，而电弧对激光焊的影响很小；在熔透条件下，增加激光功率、电弧电流对激光-电弧双面焊的熔化效率都有显著的提高。

Based on the experiments of laser-arc double-sided welding (LADSW) for a 4-mm thick stainless steel, the effects of laser power and arc current on weld cross-section, joint parameters and melting efficiency are mainly discussed. The results show that the weld cross-section of LADSW takes on the combination of typical weld profiles of laser welding and arc welding at lower heat input, while the combination characteristics doesn′t exist at higher heat input. The weld width at laser side increases with the increasing of laser power, whereas the weld width at arc side decreases at some extent. The increase of arc current can contribute to the increase of weld with at the arc side, but it doesn′t have much effect on the weld width at the laser side. The minimal weld width increases with the increase of both the laser power and arc current. The weld depth from minimal weld width to the laser side increases with the increase of the laser power, while decreases with the increase of the arc current. In the lack of penetration joint, the effect of the laser power on melting efficiency of arc welding is envident, while the effect of arc current on melting efficiency of the laser welding is little. In the full penetration joint, the melting efficiency of LADSW increases with the increase of both the laser power and arc current.