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Double-sided double arc welding (DSDAW), a high efficiency method for welding thick plate of low alloy high strength steel which does not require back chipping is used in this paper, research on multi-pass route planning for thick plate of low alloy high strength plate by double-sided double arc welding. Firstly, establish a double-sided double arc welding system that can realize thick plate of low alloy high strength steel double-sided double arc welding by double robots. Then, Propose the multi-pass route planning for thick plate of low alloy high strength steel by double-sided double arc welding by means of misplaced welding. According to the welding parameters and the geometry size of groove, plan the layers, the number of beads and the concrete position of the welding torch for each bead. Finally, the welding experiment has been done to verify the effectiveness of multi-pass route planning. The results of welding experiment are approximately agreement with the multi-pass route planning results. The backing weld can get better appearance in the front and guarantee fusion penetration in the back simultaneously. On the basis of the multi-pass welding route planning, good fusion and leveling interface can be obtained after filler passes.

Jilongshan Au-Cu deposit is a typical skarn deposit in the southeastern Hubei metallographic province of the Middle-Lower Yangtze River Fe-Cu metallogenic belt. But little study of ore-forming material source has been made in Jilongshan Au-Cu deposit. Therefore, we discussed the ore-forming material source by analyzing 15 lead geochemistry samples collected in Jilongshan deposit. The ranges of the Pb isotopic compositions are from 17.358 to 18.589 for 206Pb/204Pb, 15.414 to 15.745 for 207Pb/204Pb and 37.956 to 39.094 for 208Pb/204Pb, which are anomalous and their single-stage model ages cannot be used as a criterion for metallogenic epoch. However, the distributing characteristics of the single-stage model ages suggest that the ore Pb have mixing sources. The linear distribution of Pb isotope in tectonic model diagram suggests that the consistent relation of granodiorite porphyry, skarn, marble and ore, which is also a good proof that the ore-forming materials are partly from magma.