攪拌針形貌與旋向?qū)χ锌珍X型材FSW接頭成形的影響研究

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Abstract：The leftand rightthread stirring was used to carry outfriction stir welding of 60o5A-T6 aluminum alloy profiles，andthe influence of the thread rotation directionof the stirring needleand the rotation directionof the spindle on the welding defects was studied.A multi-field coupling calculation model of friction stir welding was established byABAQUS，andthe flowof plasticmaterials inthe weld nugget zoneand theformationof welding defects in the friction stir welding processwere simulated and analyzed.Theresults show that the simulation results are in good agreement with the test results，and the reliabilityofthe simulation is high fortheholedefects inside the weld.Under the condition thatthe shoulder thread remains unchanged，the right-handed thread stir pincan obtain a high-quality welded joint without welding defects，while the welded joint welded bythe left-hand thread stir pin producesa hole defect at the bottom of the joint，and the hole defectat the bottom of the nugget area becomes larger after changing the spindle rotation direction. Numerical calculations were used to predict that the lefthanded threaded stiring needle could not obtain a welded joint without hole defects under diferent welding process conditions.

Keywords：thread rotation direction;directionof rotation;friction stirwelding;defect

1 序言

攪拌摩擦焊（FSW）作為一種先進的綠色環(huán)保固態(tài)焊接方法，擁有焊接熱輸入量小、接頭性能強度高、殘余應(yīng)力小、無需填充材料及焊接效率高等優(yōu)點，已廣泛應(yīng)用于輕軌、地鐵、城際列車及高速列車車體制造過程中[1-3]

攪拌針的結(jié)構(gòu)設(shè)計是至關(guān)重要的環(huán)節(jié)，在焊接過程中，焊核一直處于高度波動狀態(tài)，攪拌針的尺寸及輪廓會影響攪拌金屬的攪拌能力及流動行為，從而影響焊縫的外觀和接頭的力學(xué)性能，其中螺紋的結(jié)構(gòu)形貌是關(guān)鍵因素之一。（剩余4561字）