摇动电弧窄间隙GMAW焊温度场数值分析
毕业论文关键词: 摇动电弧，窄间隙焊，热源模型，温度场，数值分析
Abstract As one kind of new narrow gap arc welding technology, undulation electric arcnarrow gap GMAW welds has distorts small, the cost low, the structure compact, theefficiency high as well as the directivity good and so on the characteristics, has solvedthe traditional arc welding sidewall fusion problem, therefore becomes the presentnarrow gap to weld the industry the first choice. But, this welding craft involves thecraft parameter to be many, does not match when still could appear flaws and so onsidewall fusion, thus has hindered the promotion which undulation electric arc narrowgap GMAW welded. In the welding process welds the temperature field to the weldedjoint size, the shape, the formation, the organization, mechanics performance has theimportant influence, therefore to undulates electric arc narrow gap GMAW to weldthe temperature field the research to be advantageous to understood thoroughly itsformation mechanism, is helpful to this craft optimization.At present undulates the type electric arc narrow gap welding technology theresearch mainly to concentrate in the process unit aspect, involves internal mechanismrelatively the research few, lacks the enough understanding to its internal formationmechanism. Along with the computer technology development, the value simulationtechnology already became the important method which the welding mechanismresearch and the craft optimized. This article from the electric arc undulationcharacteristic and the attachment geometry characteristic to the electric arc heat flowdistribution characteristic influence aspect, welds the finite element numericalanalysis model through establishment undulation electric arc narrow gap GMAW,carries on the analog computation to the weld welding temperature field and analyzesthis hot field distribution characteristic, finally surface: The model can the reasonablereflection move the temperature field the dynamic characteristic, also the welded jointcross section shape main parameter and the experiment obtains the result tallies change process is roughly consistent, the welded joint cross section base differencedoes not change for has “the split-blip” obviously the characteristic.Key words: swing arc; narrow gap welding; heat source model; temperature field;numerical simulationbasically, thus has confirmed this numerical model accuracy. When the undulationfrequency increases from 2Hz to 2.5Hz, the sidewall hot piping enters also increases,in welding process peak value temperature increment, but the molten pool shape