共查询到18条相似文献,搜索用时 168 毫秒
1.
2.
分析了Super304H不锈钢作为高合金耐热钢的工作环境和焊接工作重要性。采用两种化学成分有差异的焊丝YT-304H和Thermanit617对Super304H不锈钢管材进行焊接,对两种不同焊丝的施工焊接工艺和工艺控制措施进行了对比研究。针对Super304H不锈钢现场施焊过程,并通过焊接后射线底片评定工作、焊接试样性能检测的反馈情况,提出了Super304H不锈钢焊接时各环节的质量控制要点,从而提高了Super304H不锈钢现场焊口的合格率,完善了Super304H不锈钢焊接工艺措施的制定。 相似文献
3.
4.
《机械制造文摘:焊接分册》2017,(3):47-48
<正>焊接工艺对TP304钢焊缝金属组织及性能的影响/李海涛,等.焊接学报,2012,33(4):89-92.针对TP304不锈钢,采用三种不同的焊接工艺方法,选取合适的焊接工艺参数,成功制备三组完整的焊接接头。通过X荧光化学成分分析、显微组织观察和显微硬度试验研究了不同焊接方法对TP304不锈钢焊缝金属组织和性能的影响。结果表明,不同焊接方法下焊缝合金成分 相似文献
5.
对厚8 mm的SUS304(06Cr19Ni10)不锈钢采用等离子弧焊接,通过正交试验进行工艺参数优化,分析了SUS304不锈钢等离子弧焊接特点,并对其焊缝进行了X射线检验、力学性能及金相组织分析。结果表明,等离子弧焊接可以一次穿透8 mm厚的SUS304不锈钢,且焊缝表面美观。经X射线探伤无缺陷;拉伸试验断裂部位在焊缝处,抗拉强度符合标准要求,均能达到母材的抗拉强度值,焊缝组织为奥氏体+铁素体,热影响区与母材组织均为奥氏体+少量铁素体。 相似文献
6.
对检修过程中发现的304不锈钢焊缝裂纹及母材本体裂纹进行分析,焊缝存在较多的焊渣,以及根部未焊透是焊缝开裂的原因。母材的金相分析表明,304不锈钢晶界存在碳化物聚集,容易发生晶间腐蚀,引起母材开裂,焊接过程中,多层多道焊也容易使得热影响区晶间腐蚀加剧,引起母材开裂。304不锈钢锻造法兰的制造过程中应避免在敏化温度停留时间过长,固溶处理时应采取快冷的方式避免晶间腐蚀。焊接返修过程中,通过严格控制焊接层间温度,采用快速小热输入的工艺参数使得返修后的304不锈钢焊接质量检验合格。 相似文献
7.
8.
9.
通过超声波检验、化学成分分析、金相检验、硬度测试等方法对304不锈钢钢管焊接断裂原因进行了分析。结果表明:由于冷却较为缓慢,造成热影响区附近铬贫化,使焊缝热影响区碳化物沿晶界析出,造成的晶间腐蚀是304不锈钢钢管焊接断裂的主要原因。 相似文献
10.
焊接工艺对TP304钢焊缝金属组织及性能的影响 总被引:4,自引:3,他引:1
针对TP304不锈钢,采用三种不同的焊接工艺方法,选取合适的焊接工艺参数,成功制备三组完整的焊接接头.通过X荧光化学成分分析、显微组织观察和显微硬度试验研究了不同焊接方法对TP304不锈钢焊缝金属组织和性能的影响.结果表明,不同焊接方法下焊缝合金成分有所差异,且分布不均;各焊层显微组织形态和晶粒大小差异较大;整个接头的硬度值分布并不均匀,焊缝高于热影响区,热影响区高于母材.三种焊接方法相比,TIG-MAG焊缝的硬度值最大,TIG-SMAW的最小.对于薄板不锈钢焊接,TIG-MAG组合焊法优选. 相似文献
11.
12.
采用低耗能激光焊新工艺制造水龙头薄壳,替代传统高污染、高耗能的整体铸造工艺,对304、310 s不锈钢激光焊接头进行沸腾硫酸-硫酸铁及室温浸蚀对比腐蚀研究.在设定的腐蚀时间内,采用“原位观察”腐蚀过程焊缝及熔合区微观组织变化.结果表明,310 s比304耐腐蚀性更好,随腐蚀时间加长,接头熔合区晶粒晶界未明显加宽,焊缝断口微观特征主要为韧窝,证明其未发生晶间腐蚀.焊缝金属成分分析表明焊缝中心晶粒与母材相近,腐蚀沟Cr元素降至20.81%高于12%,保证其耐腐蚀性能. 相似文献
13.
Wenchao Dong Shanping Lu Dianzhong Li Yiyi Li 《Journal of Materials Engineering and Performance》2010,19(7):942-950
A numerical model of the welding arc is coupled to a model for the heat transfer and fluid flow in the weld pool of a SUS304
stainless steel during a moving GTA welding process. The described model avoids the use of the assumption of the empirical
Gaussian boundary conditions, and at the same time, provides reliable boundary conditions to analyze the weld pool. Based
on the two-dimensional axisymmetric numerical modeling of the argon arc, the heat flux to workpiece, the input current density,
and the plasma drag stress are obtained. The arc temperature contours, the distributions of heat flux, and current density
at the anode are in fair agreement with the reported experimental results. Numerical simulation and experimental studies to
the weld pool development are carried out for a moving GTA welding on SUS304 stainless steel with different oxygen content
from 30 to 220 ppm. The calculated result show that the oxygen can change the Marangoni convection from outward to inward
direction on the liquid pool surface and make the wide shallow weld shape become narrow deep one. The calculated result for
the weld shape and weld D/W ratio agrees well with the experimental one. 相似文献
14.
《Science & Technology of Welding & Joining》2013,18(1):57-62
AbstractThe objective of the present study was to investigate the effect of nitrogen additions to the shielding gas on the ferrite content and residual stress in austenitic stainless steels. Autogenous gas tungsten arc (GTA) welding was applied on austenitic stainless steels 304 and 310 to produce a bead on plate weld. The delta ferrite content of the weld metals was measured using a Ferritscope. The residual stress in the weldments was determined using the hole drilling strain gauge method. The present results indicated that the retained delta ferrite content in type 304 stainless steel weld metals decreased rapidly as nitrogen addition to the argon shielding gas was increased. The welding residual stress increased with increasing quantity of added nitrogen in the shielding gas. It was also found that the tensile residual stress zone in austenitic stainless steel weldments was extended as the quantity of added nitrogen gas in the argon shielding gas was increased. 相似文献
15.
提出了电弧辅助活性TIG焊(arc assisted activating TIG welding,简称AA-TIG焊)的概念,并以SUS304不锈钢作为母材,研究了AA-TIG焊接法的主要工艺参数对焊缝熔深熔宽的影响。结果表明,在相同的焊接工艺参数下,与传统TIG焊相比,AA-TIG焊缝熔深能增加一倍以上,同时熔宽明显收缩。采用AA-TIG焊可不开坡口一次焊透8mm厚不锈钢板,焊接效率明显提高。辅助电弧工艺参数和正常TIG焊工艺参数都对AA-TIG焊焊缝熔深熔宽有一定影响。 相似文献
16.
17.