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对Q345B与调质后的42CrMo合金钢的焊接性能进行了研究分析;以轨道式锻压操作机的部件夹头为例,进行了Q345B与42CrMo异种钢的焊接性研究及试验,并制订了合理的焊接工艺措施.采用SMAW打底,GMAW填充的组合焊接方法,配合合理的工艺方法及工艺参数,最终获得了性能优良的焊接接头. 相似文献
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1 问题的提出 作为公司主导产品的机械压力机,其传输动力的主要零件为全钢焊接齿轮.典型结构见图1.传统的压力机齿轮材质多为45钢,45钢齿轮经一定的热处理之后,性能基本能满足压力机的使用要求.但对于模数较小的压力机齿轮,或高速高负荷压力机,45钢齿轮在强度、耐磨、抗齿面点蚀、抗疲劳及使用寿命等综合性能方面,会显得不尽如人意.为适应国外先进的压力机已向合金钢齿轮发展的趋势,决定研制以42CrMo为代表的合金钢齿轮压力机.为此,首先需要解决42CrMo齿轮的焊接问题.42CrMo钢的化学成分和力学性能见表1. 相似文献
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风力发电机转子为合金钢42CrMo和Q235B异种钢焊接结构,采用SMAW和MAG复合热源焊对其进行焊接试验,通过金相显微镜、万能力学试验机和扫描电镜等分析方法观察和分析接头的组织性能及冲击断口形貌。结果表明:焊接热输入的增加会降低42CrMo和Q235B焊接接头的弯曲性能及低温冲击性能,实际电机转子焊接时应控制焊接热输入、预热温度和层间温度;小热输入焊接工艺制备的42CrMo和Q235B异种钢焊接接头的金相组织、力学性能和冲击断口形貌等技术指标满足企业相关规范,对后续的电机转子的焊接提供有力的技术支持。 相似文献
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本文通过分析35CrMo合金钢的自身性能与可焊性、焊缝冷裂纹产生原因、热影响区性能变化原因及对策,总结出35CrMo合金钢焊接工艺特点及冷裂纹防止措施,制定出合理的焊接工艺——合理选择焊材、焊前预热工件与焊条、焊接过程控制、焊后热处理等措施,有效解决和防止了焊缝冷裂纹的产生,使产品各性能达到规定与使用要求,彻底解决了35CrMo合金钢实际生产中的焊缝裂纹问题。 相似文献
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铁素体对大型调质齿轮钢疲劳点蚀性能的影响 总被引:2,自引:0,他引:2
针对大模数齿轮常用钢种45CrMnMo及42CrMo进行亚温淬火得到铁素体/马氏体复柑组织,通过系统的接触疲劳试验,研究了铁素体量与中碳合金钢疲劳点蚀寿命之间的关系。结果表明,在中硬度HRC37下,铁素体量对45CrMnMo及42CrMo钢的点蚀寿命有着明显的影响。随铁素体量增加疲劳点蚀寿命提高,但存在一个最佳峰值,对应的铁素体量,42CrMo为10%,45CrMnMo则为12%。 相似文献
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Electrode ENiFe-C1 and E4303 were selected to join the cemented carbide WC-20Co and carbon steel 45 by shielded metal arc welding process. Microstructure and bending property of the corresponding joints were analyzed. The results showed that the carbon steel electrode E4303 had no proper metallurgy condition for the arc welding of cemented carbide and carbon steel. The C and Ni content of the cast iron electrode ENiFe-C1 could meet the condition of preventing the formation ofη carbide,which was suit to the arc welding of cemented carbide and carbon steel,but the operation parameters needed to be optimized to minimize the slag inclusion. The alloy WC-20Co which did not fit for cold arc welding,by adopting the measure of being preheated at 723 K for 1 h before welding,and being kept at 723 K for 3 h after welding then followed furnace cooling could avoid the happening of crack in the WC-20Co base metal. 相似文献
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42CrMo激光焊焊缝组织 总被引:1,自引:0,他引:1
42CrMo合金钢C含量高、合金元素含量多、淬硬倾向大,焊接性能差。激光焊接具有功率密度高、焊接变形小等优点,适合焊接传统工艺难焊的同种或异种金属。通过额定功率为3kW的Nd∶YAG固体激光器焊接42CrMo,采用光学显微镜(OM)、扫描电镜(SEM)、X衍射、硬度仪分析了焊缝区域组织、成分和硬度变化。研究结果表明:焊缝区域组织为马氏体,热影响完全淬火区的组织为马氏体+贝氏体组织,热影响不完全淬火区的组织为贝氏体。从焊缝正面到焊缝背面的硬度分布表明:由于焊缝正面有保护气体的作用提高了焊缝正面熔池的冷却速度,使焊缝背面的硬度低于焊缝正面的硬度。 相似文献
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I. Mitelea V. Budău C. Dorohoi C. M. Crăciunescu 《Surface Engineering and Applied Electrochemistry》2013,49(1):51-56
Investigations concerning opportunities to apply the friction welding technique for joining dissimilar and graded materials are considered, starting from the advantages offered by this process in assembling parts for manufacturing equipments parts and automotive industry components. Experiments have been carried out on friction welding of heat treated 42CrMo4 with C45 steel and with the solution treated X6CrNiTi18-10 steel, as well as on joining copper with Al alloys. Metallographic observations and hardness measurements are performed in order to detail the peculiarities of the process of making joints that are difficult to obtain by conventional electric arc welding. 相似文献
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M. Balakrishnan V. Balasubramanian G. Madhusudhan Reddy 《Journal of Materials Engineering and Performance》2013,22(3):806-814
Ballistic performance of armor steel welds is very poor due to the usage of low strength and low hardness austenitic stainless steel fillers, which are traditionally used to avoid hydrogen induced cracking. In the present investigation, an attempt has been made to study the effect of plasma transferred arc hardfaced interlayer thickness on ballistic performance of shielded metal arc welded armor steel weldments. The usefulness of austenitic stainless steel buttering layer on the armor grade quenched and tempered steel base metal was also considered in this study. Joints were fabricated using three different thickness (4, 5.5, and 7 mm) hardfaced middle layer by plasma transferred arc hardfacing process between the top and bottom layers of austenitic stainless steel using shielded metal arc welding process. Sandwiched joint, in addition with the buttering layer served the dual purpose of weld integrity and ballistic immunity due to the high hardness of hardfacing alloy and the energy absorbing capacity of soft backing weld deposits. This paper will provide some insight into the usefulness of austenitic stainless steel buttering layer on the weld integrity and plasma transferred arc hardfacing layer on ballistic performance enhancement of armor steel welds. 相似文献
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通过对大厚度低合金珠光体耐热钢15CrMoR母材性能及焊接性能进行分析、试验,制订了15CrMoR钢高温压力容器的焊接工艺方案。封头对接采用气保焊,选用H08CrMnS iMoA 1.2 mm焊丝,80%Ar+20%CO2混合气体。筒体对接焊采用气保焊打底,埋弧焊填充。埋弧焊选用H08CrMoA 4.0 mm焊丝,SJ101焊剂。焊后进行消应处理。 相似文献
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分别采用D227和D237两种堆焊焊条,在45号钢基体上进行了焊条电弧焊堆焊试验.分析了在相同焊接条件下获得的堆焊层金属的显微组织和显微硬度,讨论了合金元素对堆焊层金属显微组织及显微硬度的影响.研究表明,堆焊金属与基体金属具有良好的冶金结合,第一层堆焊金属受基体金属的稀释程度影响明显,界面处金属过渡层的宽度因焊条种类的不同而异;各层堆焊金属中合金元素Cr、Mo、V含量随堆焊层数的增加而提高,堆焊金属的显微组织及显微硬度与堆焊焊条合金元素的含量有关,与其硬质相的类型、性能及分布等有关. 相似文献
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