排序方式: 共有95条查询结果,搜索用时 31 毫秒
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提出了高频感应热丝TIG焊接新方法,焊丝加热温度和深度可控,加热速度快,能适应高速送丝要求.高频感应加热消除了常规热丝TIG焊旁路电流磁场引起的电弧偏吹现象.另外,由于该方法不需利用焊丝本身的电阻产热,所以适用于铝合金等低电阻率金属焊丝.根据感应线圈的电感和工作频率要求,设计制造了适用于Φ1.6 mm铝合金焊丝的高频感应加热线圈和套筒.利用热电偶测量了不同送丝速度下的焊丝温度.结果表明,当送丝速度高达6~10 m/min时,焊丝的温度完全能够满足热丝焊的要求.6~10 m/min的送丝速度较常规TIG焊接提高了3倍以上,大大提高了焊接效率. 相似文献
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In this paper, the droplet transfer in oscillating arc narrow gap gas metal arc ( GMA ) welding was studied. According to the experimental results, the oscillating arc has effect on the droplet transfer mode. The droplet transfer frequency in narrow gap groove is higher than that in bead-on-plate welding. Because of the change of arc location in narrow gap groove, the droplet transfer in oscillating arc narrow gap changes regularly. The droplet transfer frequency near groove sidewall is higher than that at the middle of narrow gap groove. 相似文献
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304不锈钢是应用最为广泛的一种奥氏体不锈钢,它具有优良的耐蚀性和耐热性,优良的低温强度和力学性能.304不锈钢常用的焊接方法为TIC焊接.普通TIC焊接由于焊缝熔深浅、焊接速度低、焊接效率较低,而且在焊接过程中容易出现焊缝区和热影响区的晶粒粗大,造成焊接接头质量下降.功率超声振动是金属凝固过程中改善组织、提高力学性能的有效方法之一.为了提高焊接效率和改进接头的质量,将超声振动通过机械耦合方式引入304不锈钢TIG焊接的过程中,进行了平板堆焊试验.结果表明,施加超声后焊接的熔深有效增加,深宽比增大,焊缝结晶方式由粗大柱状晶转变为细小的树枝晶和等轴晶,晶粒度减小,熔合区组织均匀化. 相似文献
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理解不同超声作用下的熔池晶粒结晶特点对超声辅助TIG焊接工艺的优化具有重要意义. 以铝锂合金为研究对象,改变超声作用阶段及施加形式,分析焊缝晶粒分布特征. 结果表明,电弧熄灭后超声作用下,焊缝边缘为断裂的柱状晶,焊缝中心为等轴晶;熄弧前及熄弧后均有超声作用时,焊缝内部全部为等轴晶. 持续超声形式和瞬态超声形式对熔池晶粒结晶具有不同的作用,持续超声主要促进熔池内晶粒的异质形核而促使等轴晶形成,瞬态超声主要通过破碎枝晶细化晶粒. 超声细化铝锂合金TIG焊缝晶粒机制与超声作用阶段及形式具有直接联系. 相似文献
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A dual-beam electronic speckle pattern inteorerometry (ESPI) system was adopted to get speckle patterns for the measurement of welding dynamic displacement fields. The mathematical model of this system was described, based on which methods of the ESPI pattern image processing were discussed. Gray transformation and histogram equalization were used to enhance the contrast of speckle patterns. A discrete cosine image processing method was carried out and an exponent low-pass filter was chosen to reduce multiplicative noise in speckle patterns. Speckle grain noise can be eliminated effectively after these processes. 相似文献
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针对20 mm厚2519铝合金板,试验了大电流两道焊(DL)和小电流四道焊(XS)两种GMAW焊接工艺对焊缝成形和接头的力学性能的影响.结果表明,DL和XS焊接接头的抗拉强度都不足母材的60%,但DL接头的抗拉强度和伸长率比XS高而冲击韧度比XS低.综合DL和XS焊接工艺的优点,提出了新的大电流四道焊接工艺(DS).对接头的力学性能测试表明,DS焊接接头抗拉强度达到母材的61.2%,冲击韧度较DL焊接接头有所提升.DS焊缝区组织主要是α相和弥散分布的共晶组织;对接头进行硬度测试发现,焊缝区硬度最低,而由于θ相的重新固溶析出,热影响区硬度较焊缝区有明显提高. 相似文献
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TIG welding-brazing process with high frequency induction hot wire technology was presented to create joints between 5A06 aluminum alloy and SUS32! stainless steel using ER1100 filler wire with different temperature. The joints were evaluated by mechanical test and microstructural analyses. The welding procedure using hot fiUer wire (400 ℃ ) significantly increases strength stability by 71% and average value of tensile strength by 30. 8 % of the joints, compared with cold wire. The research of microstructures in interfaces and welded seams reveals that using 400 ℃ hot filler wire can decrease the thickness of intermetallic compounds ( IMCs ) from 6 to 3.5 txm approximately, which is the main reason of mechanical property improvement. 相似文献
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A series of experiments of tandem narrow gap GMAW for flat welding position were carried out. The arc behavior and metal transfer process were observed by a high-speed photography system. The effects of the welding parameters on the metal transfer were investigated. The results show that the arc behavior and metal transfer process of tandem narrow gap GMAW are different from these of bead-on-plate tandem GMAW. The arc behavior and metal transfer process are influenced by the distance between the two wires, the peak voltage, the pulse frequency and the peak time. With the increase of the distance between the two wires, the metal transfer mode gradually transforms from one pulse-multi droplets into one pulse-one droplet, and the average welding current increases. With the increase of the peak voltage, pulse frequency or peak time, the metal transfer mode transforms from one pulse-one droplet into one pulse-multi droplets, and the arc tends to occur between the wire and the sidewall. 相似文献