埋弧自动焊工艺参数对焊缝成形质量的影响

为了研究焊接参数对单面焊双面成形尺寸的影响规律，通过对16Mn板厚6、8、10、12mm材料的试验，确定了其单面焊双面成形的最佳参数，并找出焊接参数变化对单面焊双面成形尺寸的影响规律。16MnR是一种应用十分广泛的材料．而其中8～12mm厚度的材料是最常用的，因此对工业生产具有很好的指导作用。     

埋弧焊焊接参数对单面焊双面成形质量的影响

为了研究焊接参数对单面焊双面成形尺寸的影响规律,通过对板厚为6,8,10,12 mm的16MnR材料的试验,确定了其单面焊双面成形的最佳参数,并且找出了焊接参数变化对单面焊双面成形尺寸的影响规律,对工业生产具有很好的指导作用.     

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.     

混合气体保护单面焊双面成形自动焊在薄板中的应用

针对1.5～3mm 薄钢板拼焊时存在的烧穿、成形差、变形大等问题,分析了影响焊缝质量的因素,选择合适的焊接规范参数,进行了混合气体保护自动拼板焊接,实现了单面焊双面成形。     

铝合金熔化极脉冲氩弧焊单面焊双面成形的研究

本文通过对铝合金电弧焊实现单面焊双面成形所必须条件的分析,说明欲实现铝合金单面焊双面成形,应在工件整个厚度熔透的前提下尽可能限制合力P和提高表面张力F表。同时,通过焊接试验对影响熔化极脉冲氨弧焊电流的各敏感参数（包括脉冲电流波形、平均电弧电压和平均电弧电流、焊接速度、脉冲宽度比、脉冲频率、维弧电流及焊丝直径）对铝合金单面焊双面成形的熔透能力、电弧力和熔池下液面宽度的影响的分析研究,最终选择最佳的焊接参数进行试验,结果证明,熔化极脉冲氩弧焊工艺是解决铝合金单面焊双面成形的较好途径。当工件厚度在3～6mm范围内不开坡口用这种工艺可以较满意地实现单面焊双面成形。     

埋弧自动焊参数对单面焊双面成形质量的影响

给出了板厚６ｍｍ，８ｍｍ，１０ｍｍ，１２ｍｍ的０９ＣｒＮｉＰＣｕ钢板埋弧自动焊单面焊双面成形的基冷焊接参数，并以１０ｍｍ板为便，研究了焊接参数对焊缝形状尺寸的影响。     

药芯焊丝CO2单面角焊背面成形工艺

单面焊双面成形(简称单面焊)是将传统的双面焊接工艺转化为仅从单面施焊的工艺过程。与双面焊相比，单面焊可提高焊接生产效率3倍以上，节省材料10％，节约电能50％，且能简化装配工序。药芯焊丝CO2气体保护单面焊(简称CO2单面焊)是一种高效、节能、低成本的CO2焊接新工艺，正在逐步取代实心焊丝CO2单面焊。通过药芯焊丝CO2单面角焊的工艺试验，研究主要工艺参数和工艺因素对背面成形的影响，寻求实现良好背面成形的焊接工艺，对于大力推广使用药芯焊丝CO2单面焊是十分必要的。     

P-TIG横焊根部焊道单面焊双面成形影响因素

TIG横焊打底焊作为大型汽轮机焊接转子关键制造技术之一,国外有关公司将其作为Know-How进行严格的技术封锁。文中开展了焊接工艺参数（电弧电压、焊接电流、脉冲频率和送丝速度）对P-TIG横焊单面焊双面成形影响的试验研究。结果表明,焊接电流对根部焊道单面焊双面成形的熔透性起着决定性的作用,其次是电弧电压;脉冲频率对正面焊缝成形的影响较大,而且对于抑制熔池金属的下淌倾向具有良好的效果;送丝速度和电弧电压对背面焊缝成形影响较大,当焊接工艺参数较小时,背面焊缝不能够成形。     

手工电弧焊单面焊双面成形的机理及成形控制的探讨（上）

手工电弧焊单面焊双面成形操作技能,是锅炉压力容器焊工的一项基本技能,也是锅炉压力容器焊工培训中的难点,本文根据我们在焊工培训工作中的一些体会和经验,就手工电弧焊单面焊双面成形机理及成形控制,谈一点粗浅的认识。一、单面焊双面成形熔池的特点焊接熔池的形状、尺寸、体积以及存     

导电熔剂衬垫及其窄间隙单面焊新工艺的研究

介绍了一种新型非金属导电熔剂衬垫的制作工艺。该衬垫具有固态导电特性,可降低焊接电弧对熔池尺寸、根部间隙、焊接工艺参数的敏感度,以解决窄间隙单面焊双面成形中出现的易断弧、未焊透、反面成形差等实际工程问题。     

Experimental study on the shear strength of side fillet weld of Q235B steel post high temperatures

In order to learn the variation laws of shear strength of side fillet weld post high temperatures, the tension tests were conducted after the double-strapped side fillet welded joints which were cooled down from different high temperatures with different cooling patterns. The tests indicate that specimens appear brittle fracture at the side fillet weld during the tension tests after cooling down. The fracture su（face is located in the welding throat. The maximum temperatures undergone and the cooling pattern are major factors influencing shear strength of side fillet welded joint post high temperatures. The shear strength reduces by 24% at most within 900 ~C. Based on the experimental results, the calculation formulas of shear strength of side fillet weld post high temperatures were proposed. Conclusions supply references for evaluation damage and reinforcement of steel structure post fire.     

检测熔池背面温度的电涡流传感器设计

从电涡流传感器的测量原理出发 ,研究了电涡流传感器检测熔池温度的基本原理。经过分析发现 ,在焊接状态下 ,熔池温度与传感器输出电压信号具有单值对应性。对传感器的电参数和结构参数进行了理论计算 ,设计了带有冷却系统的电涡流传感器 ,解决了传感器受热辐射影响的问题。采用步进式脉冲TIG焊焊接低碳钢时 ,该传感器能够准确检测到熔池背面温度变化的电压信号 ,为焊缝熔透控制提供了一种新的研究方法。该传感器的优点是采用非接触测量 ,不受热辐射、弧光的干扰 ,抗干扰性强 ,结构简单 ,成本低     

Edge detection and its application to recognition of arc weld image

Abstract Image sensor has been one of the key technologies in intellectualized robotics welding. Edge detection plays an important role when the vision technology is applied in intellectualized welding robotics technologies. There are all kinds of noises in welding environment. The algorithms in common use cannot be applied to the recognition of welding environment directly. The edge of images can be fell into four types. The weld images are classified by the characteristic of welding environment in this paper. This paper analyzes some algorithms of edge detection according to the character of welding image, some relative advantages and disadvantages are pointed out when these algorithms are used in this field, and some suggestions are given. The feature extraction of weld seam and weld pool are two typical problems in the realization of intellectualized welding. Their edge features are extracted and the results show the applicability of different edge detectors. The trndeoff between precision and calculated time is also considered for different application.     

熔焊快速成型中焊缝下塌问题的研究

介绍了熔焊快速成型的计算机控制系统，该系统能够在焊接过程中对焊接参数实时调节。应用该系统进行了堆焊试验，对试验结果进行分析得出了焊接工艺参数与成型焊缝熔宽、余高之间的关系。分析了熔焊快速成型中熄弧处焊缝容易下塌的原因，并以焊接工艺参数对焊缝成型影响的研究为依据．提出了一些解决的措施。进行了单道多层和多道多层的堆焊试验，试验证明所提出的方法有效。     

CO2气体保护焊操作手法总结

通过总结CO2气体保护辉焊接操作手法，介绍了平焊、横角焊、立焊等常用位置的焊接方法，对每种焊接方法采取图文并茂的形式进行介绍，容易理解，力求最大限度的帮助焊工提高焊接质量。     

厚壁容器的单面深槽打底焊

讨论了窄间隙深槽打底焊焊接方法和工艺,认为用手工氩弧焊进行单面深槽打底焊效果最好。同时设计出最佳坡口形式,改进了焊枪结构,确定了焊接规范。     

Comparative study of weld residual stress on steel pipes with different weld types

This study developed a sequential coupling finite element procedure to predict residual stresses of steel pipes with longitudinal wela\ circumferential weld and spiral weld.The results show that the residual stress in heat affected zone(HAZ)is higher than that in weld for spiral weld pipe.For the circumferential weld pipe and spiral weld pipe,the residual stress in inner surface is higher than that in outer surface.However,for the spiral weld pipe,the residual stress in inner surface is smaller than that in outer surface.The hoop residual stress of circumferential weld pipe is higher than that of longitudinal weld pipe,while the axial residual stress of circumferential weld pipe is smaller than that of longitudinal weld pipe.The hoop stresses for circumferential weld pipe and axial stress for longitudinal weld pipe have exceeded the yield strength of base metal.With the increase of helix angle,the hoop stress decreases while the axial stress increases.For the spiral pipe(α=30° to 50°),both the hoop stress and axial stress are relatively small.The spiral pipe(helix angle ranging from 30° to 50°) is helpful to reduce stress corrosion cracking(SCC) and it is recommended to manufacture the steel pipe.     

铝合金分区活性TIG焊接法研究

针对铝合金材料,提出了一种新型活性焊接方法--FZ-TIG焊(Flux Zoned TIG Welding).在传统TIG焊接前,在待焊焊道表面中心区域涂敷低熔沸点低电阻率活性剂,在两侧区域分别涂敷高熔沸点高电阻率活性剂,然后进行正常焊接,可以同时保证焊接熔深显著增加和焊缝表面成形良好.以自行研制的FZ108活性剂进行了FZ-TIG焊,并与传统TIG焊、采用FZ108作为活性剂的A-TIG焊、采用SiO2作为活性剂的FB-TIG焊进行了对比.发现在相同参数下,采用FZ-TIG焊进行焊接,焊缝熔深明显大于传统TIG焊、A-TIG焊和FB-TIG焊,达到TIG焊熔深的3倍以上,并且焊缝成形良好,焊缝组织细化,力学性能改善.     

低碳钢非对称角焊温度场有限元分析

针对单边开坡口的非对称角根焊中熔透不稳定、成形质量差的问题,对其温度场及熔池成形规律进行分析从而优化焊接参数的选取,改善成形质量.考虑温度、对流、辐射和相变潜热对材料物理性能的影响,利用有限元分析软件建立了低碳钢非对称角焊缝有限元模型,并进行仿真计算.对比讨论了不同结构情况下焊接电流对温度场的影响,重点分析了非对称角焊接参数对背部熔宽的影响.结果表明,非对称角焊缝温度分布不均匀,背部熔宽对电流的变化十分敏感,焊接电流大小对熔池形状影响较大.通过试验得到三组熔透情况不同的焊缝,其热影响区形状尺寸与仿真结果吻合良好,从而验证了理论分析的有效性.