共查询到20条相似文献,搜索用时 218 毫秒
1.
以奥氏体不锈钢容器常用材料为例,详细介绍了选用熔炼焊剂和烧结焊剂分别进行埋弧焊工艺试验,试验结果表明,焊接接头的力学性能、工艺性能及耐晶间腐蚀性能符合标准及规程的要求.据此总结的焊接工艺,已成功地应用于焊接生产,对其他奥氏体不锈钢的埋弧焊具有较好的借鉴作用. 相似文献
2.
1概述
与熔炼焊剂相比较,烧结焊剂在我国的应用更为广泛,特别是高强度钢、耐热钢、低温钢等焊接结构中对使用性能有更高要求的产品,多采用这类焊剂。根据焊接材料行业内部的统计,烧结焊剂的国内销售量远大于熔炼焊剂。按照国家下达的科研任务,在开发590 MPa级高强度钢(HQ60)的同时,其配套材料的埋弧焊用焊剂和焊丝也开展了相应的研发工作。作为技术指标,焊态下的焊缝金属力学性能应达到表1的要求。 相似文献
3.
4.
5.
6.
7.
8.
9.
10.
11.
研制开发了一种带有预热功能的水下局部干法焊接专用排水罩. 该排水罩具有水下预热功能,适用于水下局部干法药芯焊丝半自动焊工艺,预热温度可达60~80℃. 排水罩内设计有一块覆盖于坡口周围的预热钢板,正式焊接前首先在该板上进行预热焊接,通过热传导来实现对焊接坡口的预热作用. 使用该排水罩在水池中进行了模拟焊接试验. 结果表明,焊接接头质量达到AWS D3.6M:2010规定的A级焊缝的各项性能要求. 与其它水下焊接方法的试验结果对比发现,采用所研制的带预热功能的固定式排水罩进行水下局部干法焊接时接头的最大硬度显著降低,韧性也有明显提高. 相似文献
12.
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
13.
14.
文中在常压下利用高速摄像分析了药芯焊丝焊接的熔滴过渡特点,在压力舱内进行了DH36钢的局部干法焊接工艺参数的优化研究.在此基础上,补偿了次级电缆的压降,最终确定的海下焊接试验的参数为焊接电流175~180 A,焊机的输出电压32~34 V.利用该焊接工艺参数和自行开发研制的固定式小型排水罩,在渤海海域23 m水深进行了焊接试验,并根据AWS D3.6M:2010标准对接头进行测试分析.结果表明,焊缝内无气孔、夹渣和裂纹等缺陷,焊缝组织主要是由针状铁素体、侧板条铁素体和多边形铁素体组成,各项指标均达到AWS D3.6M:2010标准规定的A级接头要求,证明了开发的基于固定式排水罩的水下局部干法CO2焊接技术可以应用在DH36钢海洋导管架结构的修复. 相似文献
15.
Austenitic stainless steel has been welded to coat pressure vessels in petrochemical plants. The material is highly susceptible to stress corrosion in chloride environments, which can damage the weld and lead to the rupture of the component. In this work we did the evaluation of the influence of welding parameters on the stress corrosion resistance of AISI 304 steel exposed to a magnesium chloride solution. AISI 304 sheets were manually welded using three different coated electrodes (AWS E309-16, E308L-16, E316L-16) and two heat inputs (5.0 and 9.0 kJ/cm). The welded samples were analysed by tensile strength tests, optical microscopy and corrosion tests carried out according to ASTM G36-73 guidelines. The results showed that the AWS E309-16 electrodes produced the best results due to the microstructure of the resulting weld metal. The presence of a network of ferrite particles in an austenitic matrix acts as a barrier to crack propagation, thus enhancing the resistance to stress corrosion of the material. This effect is associated to the morphology and distribution of the phase rather than its contents. Welding in a direction parallel to the stress axis using a relatively high heat input improved the stress corrosion of the material even further. The HAZ (Heat Affected Zone) of AISI 304 steel was highly susceptible to stress corrosion in chloride solution. The presence of carbide precipitates in the austenite grain boundary deteriorated the corrosion resistance of the steel, as they promoted anodic dissolution and the development of stress corrosion cracks. 相似文献
16.
The course of overlay welding technology qualification using welding procedure test according to the PN-EN ISO 15614-7 specifications is described. How the preliminary welding procedure specification (pWPS) should be prepared is clarified and the type of test pieces as well as the type of tests that should be carried out after overlay welding are presented. The criteria to be met by test pieces so that the welding procedure may be qualified as acceptable are discussed. The qualification range and the details of the welding procedure qualification record (WPQR) also presented. Numerous examples of overlay welding procedure qualification tests, carried out at the Welding Institute are described. 相似文献
17.
18.
汽车滚装船普遍采用高强钢薄板,焊接时容易产生变形.对平面拼板、扶强材、框架进行焊接时,在焊接材料、焊接方法、焊前预热、预变形等方面采用相应措施,能较好地控制薄板焊接变形,满足GL船级社各项指标要求. 相似文献
19.
阮兴家 《锻压装备与制造技术》2012,47(3):47-48
针对卡车厂焊装车间主焊线摇杆部件损坏状况,对各杆件和焊缝强度进行受力分析和强度校核,采用新材料和焊接工艺进行改进。改进后摇杆满足了正常工作强度要求。 相似文献