共查询到17条相似文献,搜索用时 93 毫秒
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开发了一种新型水下湿法自保护药芯焊丝,采用模拟压力舱以及自动焊接系统,在30米模拟水深的条件下进行了焊接试验,焊接结果表明焊接过程稳定,成形良好.按照美国焊接协会水下焊接标准(ANSI/AWS D3.6 1999)对获得的焊接接头的抗拉性能、弯曲性能、硬度以及冲击韧性等进行了研究.拉伸试验试件断裂位置位于母材区,弯曲试验试件弯曲180°没有发生断裂,并无明显裂纹产生,0℃冲击韧性达到30.25J/cm2.研究结果表明,自主研发的水下湿法自保护药芯焊丝可满足CCSE36等级钢的水下30米水深的焊接性能要求. 相似文献
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To investigate influence of welding parameters on weld bead geometry in underwater wet flux cored arc welding (FCAW), orthogonal experiments of underwater wet FCAW were conducted in the hyperbaric chamber at water depth from 0.2 m to 60 m and mathematical models were developed by multiple curvilinear regression method from the experimental data. Sensitivity analysis was then performed to predict the bead geometry and evaluate the influence of welding parameters. The results reveal that water depth has a greater influence on bead geometry than other welding parameters when welding at a water depth less than 10 m. At a water depth deeper than 10 m, a change in travel speed affects the bead geometry more strongly than other welding parameters. 相似文献
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0 IntroductionPore is one of the main defects produced in wet weld-ing, especially in deep water. The integrity, ductility,and strength of a wet weld will be reduced by the presenceof pores. It is very necessary to study the pore formation toimprove the quality of underwater wet welds and to ensurethe security and dependability of the welded structures.Underwater wet welding offers advantages such ashigh speed, good versatility, and cost effectiveness. It ischaracterized by lower visibility, … 相似文献
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基于自蔓延高温合成技术(SHS技术)和湿法电弧焊原理,研究了一种用于水下金属结构应急维修的新型焊接方法—水下湿法手工自蔓延焊接技术.通过焊条结构设计、焊药设计等,研制了水下燃烧型焊条,进行了焊接试验,对接头组织和性能进行了分析.结果表明,该技术可在无电、无气、无其它设备的条件下实现水下金属构件的湿法焊接,单面焊双面成形,接头抗拉强度达267 MPa,冲击吸收能量13.8 J;SEM和EDS分析表明,焊缝金属为以α-Cu固溶体为基体、有大量块状富铁第二相析出的高铁铜合金,熔合区的成分和组织与焊缝第二相基本相同,焊缝合金与熔融母材交互结晶,形成了梯度熔焊连接;拉伸断裂发生在焊缝或熔合区,断口有大量韧窝,属韧性断裂. 相似文献
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Microstructure and mechanical properties of E36 steel joint welded by underwater wet welding 下载免费PDF全文
The microstructure and mechanical properties of E36 steel joint welded by underwater welding using flux-cored wire are comprehensively investigated. The welding depth, welding current and welding voltage is 4 m, 130 A and 32 V, respectively. The weld metal is ferrite which varies in size, with carbide particles distributed on it, while the microstructure of HAZ is mixture of martensite of different size and some tempered structure. The microhardness of the weld metal is 190 HV. Almost all the tensile specimens fracture in weld metal and the average tensile strength of joint is 390 MPa, which is equal to 80% that of base metal. The tensile fracture morphology of joint presents obviously the characterization of brittle fracture, which displays the features of cleavage fracture and intergranular fracture. 相似文献
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水下湿法焊接所产生的电弧是在带电离子气体的气泡中形成的,结合前人对水下湿法焊接气泡成分的测定,分析了水下湿法焊接气泡中气体的主要解离和电离过程,对局部热力学平衡态下的不同水压、不同温度的水下电弧成分采用potapov模型进行了计算,其主要理论依据为Dalton分压定律、质量作用定律、电荷准中性条件和化学计量平衡条件.结果表明,随着水压由0.101 3 MPa变化到1.013 MPa再到10.13 MPa,离子体内H+,O,C,O+,C+的数密度呈现逐渐增加的趋势,同时电子数密度和离子体密度也跟随增加.而离子体总体平均电离度不受水压的影响.为进一步计算水下湿法焊接电弧的输运系数和水下电弧的仿真打下了基础. 相似文献
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文中采用自制的金红石型药皮焊条进行水下湿法焊接,重点分析了焊接电流和药皮厚度对熔渣物相及微观组织的影响.对熔渣的宏观形貌分析发现,当药皮厚度较薄时,焊后熔渣稀薄,覆盖不均匀,此外,焊接电流对焊接飞溅有重要影响,当焊接电流较大时,焊接过程中有大量飞溅产生.通过对熔渣的碱度系数及物相分析得出,熔渣的主要组成相为FeTiO3和CaTiO3,还有少量的MnTiO3,FeF3和Ca-Si-O相,药皮厚度和焊接电流对熔渣的碱度系数和组成相影响均较小.熔渣的微观组织分析发现,减小药皮厚度和增大焊接电流,熔渣中生成大量的树枝状组织,熔渣微观组织的方向性增强,有利于脱渣. 相似文献