INCONEL复合钢板的焊接

我厂为韩国重工业建设有限公司制造了一批压力容器,其中有很多容器采用INCONEL复合材料。该复合材料基层是SA516－60碳钢,厚度13mm;复合层为SB168,UNSN06600,AnnINCONEL,厚度2mm。为了保证这种复合材料的焊接质量,确保接头具有良好的力学性能和耐腐蚀性能,我厂做了大量的试验,对该INCONEL复合材料的焊接性能进行了研究,在此基础上确定了其焊接工艺。（1）在选择焊接材料时,基层按照等强匹配,而复层则主要考虑化学成分的等匹配和耐腐蚀的要求。（2）玻口加工尺寸如右图所示。(3)基层采用手工电弧焊,选用φ4．0mm的…     

焊接结构造价的最经济设计

研究焊接结构造价最省设计的问题,以焊接组件各部分的厚度为设计变量,约束条件为满足设计的强度要求,其中造价包括板材用料、加工成形、装配、焊接和喷漆等费用.运用RSM,K-S函数和SQP求解结构优化模型,灭菌器实例表明加强肋的均匀分布会使内壁上应力分布较合理;装配加工费用占总成本的1/2以上,在满足强度务件下,减小厚度将大大节省材料和加工费用.同时,考虑样本点分析的独立性,采用并行计算提高了计算效率,使得软件更具实用性.     

固定式交流点焊机的改造

一台固定式工频交流点焊机的焊接能力（通常指材料的种类和厚度）只能在一定范围内,当焊件厚度小于其下限时,即使将焊机功率调整到最小值,电流仍会太大,焊接时会烧穿工件而无法使用.就规模不大的加工企业而言,焊件的材料种类和厚度会随产口要求的改变而改变,但往往又不可能具备多种焊机.以DN-10型点焊机为例,说明了交流点焊机改为储能、交流两用点焊机的方法.     

船用钛合金研究进展(四)

焊接性能是船用结构材料的关键性能指标,为了考查新型船用Ti-75合金的焊接性能,进行了系统的工艺与性能研究.焊接在自制NZA3—300型钨极脉冲TIG焊机上进行,样板采用14mm的Ti—75合金工业厚板.焊前准备、坡口加工、焊接环境、焊缝保护、焊接过程清理以及焊缝层间温度控制均按标准要求进行.为了保证焊接接头具有良好的塑性,采用专门为该合金设计加工的配套焊丝和5个9的高纯氩气     

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线性摩擦焊接技术作为一种新兴的焊接技术,具有焊接温度低、焊接质量高、焊接过程无污染等诸多优点,已经成为最经济、实用的加工技术之一.通过对比不同焊接参数下TC17材料的冲击性能,得出焊接时间对材料的冲击性能影响很大,并确定在焊接频率为20Hz,振幅为4mm,压力为7个刻度值,焊接时间为12s时,材料的冲击性能相对较好且数值稳定,为以后发动机叶盘的焊接提供了依据.     

风电机组塔架焊接质量控制

焊接是风电机组塔架制造过程中的至关重要的环节,塔架焊缝的质量直接影响到整个机组的使用寿命.焊接过程的控制和管理对最终塔架焊缝的质量起到决定性作用.本项目塔架制造材料为SM520BTMC钢板,厚度范围为16.5～71.3 mm.文中从焊接质量控制的角度出发,阐述了塔架焊接过程中对塔架材料、焊接材料、焊接工艺评定、焊前准备...     

激光拼焊生产线在汽车制造业的应用

传统汽车车身零件采用整体成形工艺,随着汽车行业工艺技术的发展,分离成形逐渐得到了应用,旅光拼焊技术就是分离成形中的典型代表.该技术是基于成熟的激光焊接技术发展起来的新型加工工艺技术,通过高能量的激光将两块或者多块经过裁剪的不同材质.不等厚度的钢材焊接成一个整体板,然后再进行冲压成形,以满足不同部位对材料不同性能的要求.     

00Cr26Mo1超纯高铬铁素体不锈钢的焊接

介绍了在高温、高腐蚀性介质中工作的00Cr26Mo1超纯铁素体不锈钢材料的性能及其焊接技术要求.为防止焊接接头脆化和晶间腐蚀,在焊接试验的基础上制定了合理的产品现场焊接工艺,包括焊接材料和焊接参数及相应的焊接技术措施.实践证明,通过严格加强焊接全过程保护,防止焊接过程污染,能够获得优良的焊接质量.     

TUZr0.15锆无氧铜手工TIG焊焊接性试验研究

针对TUZr0.15锆无氧铜开展了手工TIG焊焊接性试验研究,分析测定了材料不同纤维方向的力学性能差异;8mm焊接厚度满足焊接要求的预热温度;通过焊接接头质量检测和接头力学性能测试结果,提出了该材料焊接焊丝的选用意见;对焊接接头进行了金相组织分析:焊缝与母材的显微组织同为α-Cu相.焊缝区靠近熔合线附近为柱状晶组织,焊...     

低碳钢与低合金钢焊接工艺

通过对低碳钢与低合金钢的焊接性能进行分析,选用适宜的焊接方法、焊接材料、检测手段,采取相应的质量控制措施,制定了适宜的焊接工艺,确保产品焊接接头性能符合产品技术条件要求.     

压力容器焊接接头低温韧性的改善技术

制造低温压力容器过程中,经常会出现不同钢材焊接接头低温韧性不达标的问题。为了改善工作于低温环境的压力容器用低合金低温钢、镍合金钢和铬镍奥氏体不锈钢的焊接接头低温韧性,而采取改进焊接材料、严格控制焊接工艺的措施。并指出研究工作于低温环境的压力容器用焊接材料的必要性。     

低碳钢多层板点焊动态过程测试与分析

在电阻点焊生产过程中,时常会遇到不同层数的搭接点焊接头.由于多层板接头在实际点焊过程的焊材厚度发生了明显的变化,使得焊机二次回路中的阻抗大幅度波动.因而焊接热量也必然产生显著波动.若不能及时有效地实时调节焊接热量,熔核质量无法保证.通过对焊接热过程的动态测试与分析,探讨了3种不同机制监控方法对低碳钢多层数点焊的适应性,为生产企业选择准确的监控模式和进行有效的质量控制提供了科学依据.     

压力容器焊接质量控制的研究与实践

从保证压力容器制造质量的关键环节——焊接着手,经过长期研究与实践,提出了影响压力容器焊接质量五个方面的主要因素,即:操作人员因素、机器设备因素、原材料因素、工艺方法因素、环境因素,简称"人、机、料、法、环"。通过对上述五因素的分析,提出了压力容器焊接质量分析因果图,按照该因果图,在压力容器制造的实践中取得了良好的效果,其理念和指导思想在压力容器制造行业中具有一定的推广应用价值,对提高我国压力容器制造质量,特别是对焊接质量控制具有一定的指导作用。     

800MN模锻压机夹紧梁窄间隙埋弧焊工艺

分析800 MN模锻压机关键部件夹紧梁焊接结构制造难度,其制造难点在于产品平面度要求较高、易产生冷裂纹、目前常规窄间隙焊机设备能力有限。针对上述制造难点及低合金、高强度钢大厚板的焊接特点,选用合适的焊接方法和焊接材料,采用对称两条焊缝的交替焊接,并根据产品要求对焊枪部分进行改进及焊后立即进行消氢处理等措施,保证产品制造的精度和质量,很好地控制了焊接变形和焊接接头质量。相关工艺及措施对类似大厚板焊接工程应用具有一定的借鉴和参考价值。     

Influence of interpass temperature on the properties of duplex stainless steel during welding by submerged arc welding process

Duplex stainless steels are materials that present high corrosion resistance with high values of mechanical strength, therefore motivating their use in various components in the offshore industry. However, there are major challenges in the welding of these materials in terms of the productivity and quality of the joint produced, considering its extensive use for components of small thickness, such as umbilicals, to those of large thickness, such as salt water injection pipelines. In relation to pipes of small thickness, the gas tungsten arc welding process is successfully used. In thick-walled pipes, the automatic process of submerged arc welding (SAW) has been recently implemented in lines of pre-assembled piping, and this has considerably increased the productivity of the joints produced, though, a great deal of time is required to perform a new weld pass, due to the fact that the maximum interpass temperature needs to be lower than 150 °C. This work presents the results of characterization and the evaluation of corrosion resistance of a welded joint corresponding to DSS UNS S31803, with a wall thickness of 21.4 mm, welded by the gas metal arc welding process in the root and SAW process in the filling and cap passes, employing an interpass temperature between 150 and 290 °C. The results of the characterization of the mechanical properties, chemical composition and corrosion resistance in different regions of the welded joint were compared with those obtained for the base metal of the pipe, as well as with the minimum values required by the project standards. Therefore, this study has made an evaluation of the influence of the interpass temperature in the properties of the joints produced, motivated by a possible increase in productivity in pipe welding.     

Welding of high thicknesses using a fibre optic laser up to 30 kW

The industrial applications of high-power fibre optic lasers include welding, 2D and 3D cutting, remote cutting and welding, brazing and surface treatments. The availability of fibre optic lasers with power outputs in excess of 10 kW might allow the development of novel fields of application in the welding of high thickness pieces: shipbuilding and offshore industries, pipe and cable manufacture and other heavy industry sectors. Carrying the beam by fibre optics allows high flexibility, even for the production of very large pieces, such as in the shipbuilding sector. This study describes the laser welding of high thickness pieces using a 30 kW laser and a 200 μm diameter fibre. On the one hand, such lasers allow a weld penetration depth of over 30 mm in a single pass, and very high process speeds for thinner materials on the other. Combining lasers with conventional arc welding techniques (hybrid welding) allows further optimization of weld quality and makes it possible to weld butt joints with a ‘gap’ of up to 1 mm. This paper presents the most recent results from very high-power fibre optic laser welding along with new applications in the manufacturing sector.     

Friction stir welding of AZ31 magnesium alloys processed by equal channel angular pressing

Equal channel angular pressing (ECAP) is an effective thermo-mechanical process to make ultrafine grains.An investigation was carried out on the friction stir welding (FSW) of ECAPed AZ31 magnesium alloys with a thickness of 15 mm.For different process parameters,the optimum FSW conditions of ECAPed AZ31 magnesium alloys were examined.The basic characterization of weld formation and the mechanical properties of the joints were discussed.The results show that the effect of welding parameters on welding quality was evident and welding quality was sensitive to welding speed.Sound joints could be obtained when the welding speed was 37.5 mm/min and the rotation speed of the stir tool was 750 r/min.The maximum tensile strength (270 MPa) of FSW was 91% that of the base materials.The value of microhardness varied between advancing side and retreating side because of the speed field near the pin of the stir tool,which weakened the deformed stress field.The value of microhardness of the welding zone was lower than that of the base materials.The maximum value was located near the heat-affected zone (HAZ).Remarkable ductile character was observed from the fracture morphologies of welded joints.     

纯铝中厚板双丝单面焊双面成形工艺

针对厚度为12 mm的纯铝板材,采用自动双丝焊技术进行焊接工艺试验.试验结果表明:采用自动双丝焊技术焊接12 mm厚纯铝板可一次性成形,单面焊双面成形.焊接过程稳定、焊缝成形好,焊接接头具有优良的焊接质量和力学性能.     

Laser keyhole micro welding of aluminum foils to lap joints even with large gap sizes

The increasing miniaturization of components leads to increasing demands on manufacturing processes. High-brilliance lasers allow fast, low-heat deep penetration laser welding to produce narrow seams even in metal foils. In micro-joining, adjusting comparatively small gaps is a major challenge. Here, the welding of 100 µm thick aluminum foils in lap joints is investigated. Gaps of > 80% of the foil thickness were bridged. The results show that the seam width can be used to detect not only the gap size but also inner connection defects for quality control purposes. The explanation for this is the increasing gap-bridging keyhole depth, and thus heat input with increasing gap size.