圆形焊接弯管的径向变形受力分析

圆管段或圆锥管段在端口与其它圆管段或圆锥管段形成角连接时,角连接焊缝处不同管段由于变形的方向不一致而使内应力形成了一定的角度从而使得在径向形成了合力,这个合力阻止径向变形。

焊接弯管节间相贯线及坡口的修正方法

焊接弯管由多个斜口管节组成,其组装精度及焊接质量主要取决于节间相贯线的放样精度和节间坡口尺寸精度。各管节如按钢管中径展开放样,受钢板厚度影响,会造成很大尺寸偏差。文章以DN1500弯管为例,分析尺寸偏差原因,并提出弯管节间相贯线及坡口的修正方法。

大管径渐放管及焊接钢弯管局损系数简析

本文运用数学分析的方法,得出焊接钢弯管的管径与局部水头损失系数之间存在显著的对数相关关系;渐放管的d/D和(D/2)1/6与局部水头损失系数之间存在显著的多元回归关系。从而较好地解决了困扰设计者的大管径焊接钢弯管及渐放管的局部水头损失系数的取值问题,对水利工程设计具有较强的实用价值。

一个大管径流量监测方法的尝试

本文根据大管径汽水管道焊接弯管的阻力特性,尝试了一个利用焊接弯管监测流量的方法、该方法简便、实用,满足工程要求。

安全技术、劳动保护和环境保护

分析研究了紫外线辐射和焊接烟尘浓度的动特性,介绍了焊工在工作中承受辐射的最长时间和焊接方法之间关系的列线图。图3男叹】10焊工与危险伴行仁德」// Ihaktiker一1卯7,49(8)一374一375 不遵守焊接工程安全技术规则的焊工,易于遭受到外伤的损害。在地面上跨越软管、电缆等都有遭受外伤的可能。

Weld Characteristics and NC Bending Formability of QSTE340 Welded Tube

The mechanical characteristics of the weld joint were investigated by tensile test, microstructure test, and microhardness test. The welded tube NC bending tests were carried out to evaluate the weld on the formability of the QSTE340 welded tube. The results show that the wall thinning degree, cross-sectional deformation and springback angle increase significantly as the weld line is located on the outside of the bend compared with that located on the middle and inside, and the welded tubes produce nearly identical performance as the weld line is located on the middle and inside. The wall thickening degree decreases much as the weld line is located on the inside of the bend. So the welded tube can acquire good bending formability as the weld line is located in the region away from the outside of the bend.