Research In Technology Of MIG Brazing Overlaying Welding Bearing Band

In order to meet the requirement of manufacture technique of bearing band for new kind of shell, the method of overlaying welding bearing band using MIG brazing was first advanced in the civil, the technology of copp -er wire 201, bronze wire 211, brass wire 221 has been studied.The effect of welding parameters on weld formation has been studied by using zheng jiao analyzing method and the best technology parameter of overlaying we -lding bearing band was completed. The effect of welding process paramete -rs on the tensile strength and Fe content of the copper and shear stren -gth was analyzed.The interface microstructure of the joints was analyze d by means of optical microscope , SEM and EPMA.The result shows that with the increase of weld current and weld spe -ed,Fe content increase,, (Fe content is the important target of bearing band. ) The effects brought by difference in the weld current and weld speed on the shear strength is not important and on the tensile strength is pivotal'. In the MIG with filler wire .with the increase of wire feed speed, transition coefficient of Zn trend to decrease.The bearing band obtained by201,211,221 correspond to welded overlay rotating band quality check and accept standard which consists of tensil -e strength, rigidity,shear strength and Fe content.