钢结构桁架电弧焊焊接接头腐蚀疲劳性能试验研究

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Abstract：Inorder to explain the relationship between corrosion and fatigue of welded joints in steel truss structures using arc welding，analyze the safety of the structure，and study its corrosion fatigue performance through experiments.Arc welding was used to weld steel structure truss joints. After welding，the corrosion fatigue performance of the welded joint was tested，the microscopic morphology was observed，and the influence of swing during arc welding on corrosion fatigue performance was analyzed，and the influence of corrosion on fatigue performance was studied，and the test results showed that increasing the number of fatigue cycles would reduce the fatigue performance of welded joints，and the extension of corrosion time further weakens the fatigue resistance.The immersion in corrosion solution leads to corrosion products in the joint.Thecorrosion products are more in lowcurrent arc welding and less inhigh-current welding.The ultimate residual stress of swing arc welding is higher than that of non-swingarc welding，andthepositionof theultimateresidualstress iscloser totheweld，the non-swing arc welding jointresidual stress islower，and its fatigue lifeislonger.Duringsmallcyclicloading，thecrack propagation rateis higherintheairenvironment.With theincreaseofcyclic load，therateincorosiveenvironment increases significantly.

Keywords： steel structure truss;arc welding;welding joint;saltcorosion;fatigue performance; residual stress

1 序言

钢结构桁架在现代建筑、桥梁以及其他重要工程中扮演着至关重要的角色，其具有轻质、高强度和抗震性能良好的特点，在现代工程中得到了广泛应用；作为连接钢材的主要方法之一，电弧焊因其高效性和灵活性而被广泛应用。（剩余6399字）