冰箱用铜铝管接头的储能焊

本文介绍了冰箱铜铝管接头的性能要求,简述了 PW—1焊机的工艺过程和特点,主要焊接参数的控制方法和效果,列举了由该焊机所焊铜铝管接头的各项性能,并结合对接头的进一步分析及在生产线上的实际应用,提出 PW—1焊机的应用前景.     

SiC增强铝基复合材料焊接特性及其储能焊

分析了SiC增强铝基复合材料的焊接特性。讨论了SiC增强铝基复合材料熔化焊、钎焊和固相焊的研究现状。结合试验,重点探讨了SiC增强铝基复合材料储能焊,分析了储能焊焊接接头的金相组织,其焊接接头由熔核区、熔合区及热影响区组成。由于大的冷却速率使得熔核组织显著细化,具有快速凝固组织特征,表明储能焊可实现铝基复合材料的焊接,且具有独特的优点。     

冰箱用铜铝管接头的简易电容储能焊方法

介绍了一种冰箱用铜铝管接头的简易电容储能焊方法及工艺。这种方法已在实际生产中得到成熟的应用,其接头质量能满足冰箱产品的技术要求。     

铝合金储能焊快速凝固接头组织分析

采用微型储能焊机对厚度为0.4mm的LF2铝合金薄板进行快速凝固点焊,研究分析了接头组织形貌和形成机理。结果表明,储能焊能够实现LF2铝合金薄板的快速凝固焊接,焊接接头由熔核区、熔合区和热影响区组成。极大的冷却速率使得接头组织瞬间形核并快速生长,形成组织细小致密具有快速凝固特征的焊接接头。焊接裂纹是LF2铝合金储能焊主要焊接缺陷。对焊接裂纹机理分析发现,铝合金线膨胀大导致焊接应力产生是形成焊接裂纹的主要原因。     

铝锂合金搅拌摩擦焊(FSW)接头金相组织

~~铝锂合金搅拌摩擦焊(FSW)接头金相组织$哈尔滨工业大学现代焊接生产技术国家重点实验室!150001@陈国庆 $哈尔滨工业大学现代焊接生产技术国家重点实验室!150001@冯吉才 $哈尔滨工业大学现代焊接生产技术国家重点实验室!150001@王大勇 $哈尔滨工业大学现代焊接生产技术国家重点实验室!150001@于捷     

铝基复合材料振动液相扩散焊焊接接头金相组织

鬓纽一仲些撇20%SIC颊拉增崛铸铝101,颗粒平均尺寸为12印咚,基体中含有初生si六焊缝区笋畜潺蘸黔燕黔髓瀑瞥卜嘴飞华羲夔谬翼攫葬煮象i己攀馨毋华熬曝翼晒图1母材组织50Ox(2/3)即蜂嘿篡{即哗/3)簿藻撇黝霎鬓漏烤湘粗犯听之赞份飞婪勇粉黔彝馨翁缓魏冬乌撤粼翰飘蒸i)藻巍黔姗塔瓶侧然娜瞬欲;冲幼,石舒撇墨鲤狐巍姗黔鬓黝嘟甲3焊缝局都放大200双2/3) 冲一恤光未浸蚀)罩丹一班弃征扭篡焊缝局部放大500以2分3) (抛光未浸蚀)图5化学浸蚀后俱缝组织琴琴)声oox(2/3) (Z士一AI基体千si公颗粒斗初生si)一母材鬓扮鑫姗洲品城酥牛黔蒸搬瓤;瓢颧歉咒…     

直缝埋弧焊钢管焊接接头坡口角度的修正

直缝钢管埋弧焊的焊接接头设计因卷圆成型后形状变化而改变了坡口角度,给内外焊缝的施焊带来困难。本文探讨了坡口角度的预修正计算方案。     

电冰箱铜铝接头的直流闪光焊

在对电阻对焊，电容贮能焊，交流闪光焊等不同工艺焊接的铜铝接头的微观组织及焊接工艺特征分析的基础上，通过在研制的直流闪光焊机上进行了焊接试验表明，电冰箱铜，铝接头的直流闪光焊，不仅可使焊缝在一定的条件下不泄漏，不开裂，并可排除微观组织中的脆性相γ２（Ｃｕ９Ａｌ２）。     

铝铜异种金属冷压焊及其焊缝接头显微组织和性能

研究了铝铜异种金属冷压焊的焊接工艺,对铝和铜的焊接性能及冷压焊的焊接特点进行了分析.用冷压焊进行了铝铜异种金属对接接头的焊接试验,并对冷压焊的焊接工艺参数的选择进行了试验和分析.对焊接接头的显微组织、抗拉强度、抗弯强度、电阻性能、耐温度变化性能及接头耐高温性能进行了试验和分析,其结果为铝铜异种金属焊接在电气产品中的使用提供了依据.     

焊接接头形式对CO2焊未焊透的影响

本文通过改变汽车后桥壳体CO_2焊接头设计,达到防止未焊透缺陷产生的目的。经对比试验,确定出合理的接头形式及坡口尺寸。     

Ni在钢/铝电阻点焊中的作用

以DC01钢板与5082铝合金板为基材,在电极压力3 kN、焊接时间300 ms、保持时间100 ms条件下,研究了电阻点焊中焊接电流(9～12 kA)及Ni镀层对接头剪切力、正拉力、界面相组成的影响。结果表明,随焊接电流的提高,熔核尺寸增大,接头力学性能提高。剪切力比正拉力高一个数量级。在10 kA焊接电流下,镀Ni钢/铝接头的剪切力和正拉力均比钢/铝直接焊接时强度明显提高,这与钢/铝界面形成了Al3Ni合金相,抑制了脆性Fe2Al5金属间化合物的生成有关。     

Characterization of aluminum/steel lap joint by friction stir welding

The welding of a lap joint of a commercially pure aluminum plate to a low carbon steel plate (i.e., Al plate top, and steel plate bottom) was produced by friction stir welding using various rotations and traveling speeds of the tool to investigate the effects of the welding parameters on the joint strength. The joint strength depended strongly on the depth of the pin tip relative to the steel surface; when the pin depth did not reach the steel surface, the joint failed under low applied loads. Meanwhile, slight penetration of the pin tip to the steel surface significantly increased the joint strength. The joint strength tended to increase with rotationspeed and slightly decrease with the increase in the traveling speed, although the results were quite scattered. The effects of the welding parameters were discussed metallographically based on observations with optical and scanning electron microscopes.     

铝/钢异质金属旋转摩擦焊研究进展

铝/钢旋转摩擦焊具有焊接质量好、焊接效率高的突出优势,特别适合轴类、管类结构的焊接制造。但是,由于旋转摩擦焊独特的旋转运动形式导致接头中微观组织与接头性能沿径向分布的不均匀性,成为制约其在关键领域应用的瓶颈之一。文中综述了铝/钢异质金属旋转摩擦焊国内外研究现状,主要分析了旋转摩擦焊工艺、微观组织与力学性能等,并探讨了铝/钢旋转摩擦焊技术未来研究的方向。     

铝/钢异质金属旋转摩擦焊研究进展

铝/钢旋转摩擦焊具有焊接质量好、焊接效率高的突出优势,特别适合轴类、管类结构的焊接制造。但是,由于旋转摩擦焊独特的旋转运动形式导致接头中微观组织与接头性能沿径向分布的不均匀性,成为制约其在关键领域应用的瓶颈之一。文中综述了铝/钢异质金属旋转摩擦焊国内外研究现状,主要分析了旋转摩擦焊工艺、微观组织与力学性能等,并探讨了铝/钢旋转摩擦焊技术未来研究的方向。     

基于BC-MIG焊的铝/钢异种金属增材制造工艺

以2 mm厚Q235镀锌钢板为基板,直径1.2 mm的4043铝合金焊丝为增材材料,利用BC-MIG焊工艺进行增材试验,得到了成形美观,性能优良的T型材结构. 采用金相显微镜、显微硬度仪、万能拉伸试验机对接头的组织形貌、硬度分布、剪切性能进行研究,获得了沉积层的组织和力学性能的变化规律. 结果表明,沉积层最底部靠铝一侧和靠钢一侧分别形成细长针状和带状Fe/Al化合物,沉积层中部由向上生长的树枝晶组成,而在沉积层顶部的组织没有定向生长的趋势. 剪切试验表明,铝/钢异种金属T型材最大可承受2 108 N的剪切力,剪切角达到13.5°时,受力一侧堆焊层根部发生断裂,堆焊层上无明显裂纹.     

Influence of welding position and parameters in orbital tig welding applied to low-carbon steel pipes

The most notable characteristic of Orbital TIG welding is the constant geometric profile of the tubes. In the context of orbital TIG welding of tubes with a large diameter and thick walls, the relationship between the welding position, the use of constant or pulsed current and also the value of the average current on the geometric characteristics of the beads obtained was studied. We deposited welds on SAE 1020 carbon steel tubes, as well as taking macrographs of the cross-sections of the beads using optical microscopy. High-definition films were used to understand the behaviour of the weld pool in different welding positions. The geometric characteristics were quantified using macrographs and software, and the relationship between these characteristics and the above-mentioned variables were traced. In addition, an analysis of the microstructure of the samples was carried out, correlating with Vickers microhardness. It was concluded that the beads welded with pulsed current were more reinforced and wider, as well as being harder and having a finer microstructure. The vertical up position resulted in beads with a lower shape factor and more penetration, and the overhead position resulted in beads with a low shape factor.     

镍基焊材返修P92小径管焊口工艺

P92钢是新型铁素体耐热钢,目前国内采用其匹配焊材进行返修,焊后需进行再次热处理,而多次热处理会造成管壁的性能下降,且需要花费大量的时间和成本。在临时性返修没有匹配焊材的情况下,采用镍基焊材进行P92钢管焊口返修,返修后免做热处理,避免多次热循环对管子性能的影响,然后进行各项性能试验。结果表明,返修后的焊接接头拉伸试验合格,断裂位置位于母材;焊缝、热影响区、母材的硬度值符合规定要求;焊缝、热影响区的冲击值符合规定要求;金相组织合格。试验证明,采用镍基焊材进行临时性返修试验是可行的,但对于高温时效性能及持久强度性能,还需要进一步研究。     

钢与铝异种金属的压焊技术研究

随着汽车工业的发展,对汽车节能、环保、安全的要求越来越高,轻量化技术是实现其目标的重要途径.作为汽车轻量化材料中最主要的两类材料,高强度钢板和铝合金组成的钢-铝一体化车身成为轻量化的发展技术路线.综述了钢-铝异种材料在汽车工业中电阻点焊技术的研究现状,重点介绍复合板过渡层法和金属涂层法的工艺方法,利用垫片法探讨了钢-铝...     

焊接工艺对2205不锈钢管焊接接头力学性能的影响

本文利用金相显微镜和扫描电子显微镜（SEM）手段,研究了焊条电弧焊（SMAW）和钨极氩弧焊（GTAW）焊接方法对2205双相不锈钢管焊接接头微观组织和拉伸性能的影响,结果表明,GTAW焊接接头中奥氏体相含量较SMAW多。通过拉伸试验测试,GTAW焊接接头较SMAW表现出更好的力学性能。     

Experimental and numerical analysis on aluminum/steel pipe using magnetic pulse welding

Recently, there has been a trend in the automotive industry to focus on the improvement of lightweight materials, such as aluminum and magnesium because the welding of dissimilar metals causes many welding defects. Magnetic pulse welding (MPW), one of the solid state welding technologies, uses electromagnetic force from current discharged through a working coil which develops a repulsive force between the induced currents flowing parallel and in the opposite direction in the tube to be welded. The objective of this paper is to develop a numerical model for analysis of the interaction between the outer pipe and the working coil using a finite element method (FEM) in the MPW process. Four Maxwell equations are solved using a general electromagnetic mechanics computer program, ANSYS/EMAG code. Experiments were also carried out with a W-MPW60 machine manufactured by WELMATE CO., LTD. with the Al1070 and SM45C for Al pipe and steel bar respectively. The calculated and measured results were compared to verify the proposed model.