本文選題：高強鋼 + 異種鋼　； 參考：《焊接學報》2017年07期

【摘要】：采用一種新型復合焊接工藝——電阻塞焊對1.5 mm等厚TRIP980高強鋼/SPCC低碳鋼板進行焊接,利用正交試驗優(yōu)化其焊接參數(shù),隨后增加焊前預熱,分析對比無預熱和焊前預熱兩種條件下較優(yōu)焊接參數(shù)時接頭的力學性能及組織、硬度特點.結(jié)果表明,各焊接參數(shù)對接頭的拉剪載荷影響程度由大到小依次為焊接電流、填充物直徑、焊接時間及電極力;在電極頭端面直徑為8 mm的條件下,填充物直徑為5.5 mm時的接頭力學性能優(yōu)于其它直徑;相同焊接參數(shù)時,焊前預熱塞焊接頭的拉剪載荷比無預熱提高7%以上;兩種條件下較優(yōu)焊接參數(shù)時,焊前預熱塞焊接頭的熔核偏移量小于無預熱,熔核和熔合區(qū)的硬度比無預熱時有所下降,熔合區(qū)脆硬馬氏體組織比無預熱少;焊前預熱塞焊接頭斷口為韌性斷裂,無預熱塞焊接頭斷口為脆性斷裂;其主要機理是,預熱減小了熔核區(qū)金屬過熱傾向,使熔核擴展均勻,熔合區(qū)脆硬組織減少,有利于接頭強度的提高.
[Abstract]:A new type of composite welding process, electric blocking welding, was used to weld 1.5 mm high strength steel / SPCC low carbon steel sheet with equal thickness TRIP980. The welding parameters were optimized by orthogonal test, and then preheated before welding was added. The mechanical properties, microstructure and hardness of the joints under the optimum welding parameters were analyzed and compared with those without preheating and pre-welding. The results show that the influence of welding parameters on the tensile and shear load of the joint is in the order of welding current, filling diameter, welding time and electrode force, and when the end surface diameter of the electrode head is 8 mm, When the diameter of filler is 5.5 mm, the mechanical properties of joints are better than other diameters, and the tensile and shear loads of preheated plug welding joints before welding are more than 7% higher than those without preheating when the welding parameters are the same. The nugget deviation of preheating plug welding joint before welding is less than that without preheating, the hardness of fusion and fusion zone is lower than that without preheating, the brittle martensite structure in fusion zone is less than that without preheating, and the fracture surface of preheating plug welding joint is ductile fracture before welding. The fracture surface of welded joint without preheating plug is brittle fracture, and its main mechanism is that preheating reduces the tendency of metal overheating in the nugget zone, makes the nugget spread evenly, and reduces the brittle and hard microstructure in the fusion zone, which is beneficial to the improvement of the joint strength.
【作者單位】： 內(nèi)蒙古工業(yè)大學材料科學與工程學院;
【分類號】：TG453.9

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