[哪位高手帮忙翻译一下毕业设计的英文摘要 ！万分感谢]This book is DianFenChang zhuanglang county xin xi environmental impact assessment report (because, for reference book of material, the authors used data from m...+阅读
AbstractK40 portal tower crane is the construction of a transport machinery, steel products for its main Q235B and Q345B, the main choice of the welding method for melting a gas welding and electric arc welding electrode, the choice of ER50-6, specifications Ф1.2 The wire, the protection of gas for 80% Ar +20% CO2, welder for KR Ⅱ -500. Selection of the electrode arc welding electrode for E4303 and E5015.Based on the K40 tower crane at the door of the structural characteristics of the main parameters of that understanding K40 portal tower crane work. Through the base metal welding and welding deformation and welding method of analysis, welding equipment, welding norms of choice, thereby assessing the report prepared by the welding process, then the preparation of K40 portal tower crane Rotary and portal box girder of the manufacturing process .K40 portal tower crane manufacturing process includes preparation process, cutting process, the assembly - welding technology, quality inspection and paint store. Through the portal K40 tower cranes and portal rotating box girder of the material as an example of the recheck, steel and surface preparation of Correction, crossed, of materials, cutting edge processing and assembly - welding, welding After the inspection process in detail, and in the process of equipment required for the simple introduction.Key words:Tower crane; rotating body, box girder, Manufacturing Technology
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