It is confirmed that the primary reason causing abnormal vibration is the impeller weld metal porosity.
从造粒机洗涤塔抽风机（Ｕ－１５０）的结构特点入手，结合风机异常振动情况，通过风机的振动信号分析和叶轮的着色探伤，确认叶轮叶片的焊缝气孔是风机异常振动的根本原因。
Porosity Causes Comprehensive Analysis and Preventive Measure of SSAW Pipe
螺旋缝埋弧焊管焊缝气孔产生原因综合分析及防止措施
Generation and Elimination of Slag in Gas Pocket of Spiral Submerged Arc Welded Pipe
螺旋埋弧焊管焊缝夹珠型气孔的形成与消除
Close examination of the plug welds showed the existence of herringbone patterns near the slag and voids in welds.
对塞焊焊缝的详细检查表明在焊渣及气孔附近，焊缝中存在着人字型裂纹。
Any severe deficiency of welding seams surface like cracks, pores, slags is forbidden.
焊缝表面不得有裂纹,气孔,夹渣等严重缺陷.
Weld identification single hole punch.
鉴别焊缝的单孔冲压机
Formative Factors and Preventive Measures of Weld Porosity in Butt Welding of Oil & Gas Transmission Pipeline
油气输送管道对接焊缝中气孔的成因及控制措施
Thus the fracture likely initiated from fatigue sharpened cracks originating from slag and void in the plug welds.
因此，断裂可能是由于从塞焊焊缝内的焊渣和气孔外形成的尖锐的疲劳裂纹而产生的。
Research on Welding Seam Tracking System of CO_2-shielded Welding;
CO_2气体保护焊焊缝自动跟踪系统研制
Application of the electrogas welding for the blast furnace jacket
气电立焊在高炉炉壳立缝焊接的应用
openings through or near welded joints
通过或靠近焊缝处的开孔
Research on Welding Seam Formation Characteristics of Manual Arc Welding and CO_2 Gas Protection Welding
手工电弧焊与CO_2气体保护焊焊缝成形特征研究
GMAW short-arc tack welds shall not be incorporated into the root pass.
熔化极气体保护焊-短弧点焊焊缝不能与根部焊道合成一体。
CO_2 Gases Welding Seam in the Application of the Steel Docking;
CO_2气体保护焊在管钢对接焊缝中的应用
2 All welds for nozzles and manways shall be full penetration through the vessel wall.
接管和人孔的焊缝应为穿过容器壁的全熔透。
Research and Control of Keyhole Feature and Weld Formation Stability in Variable Polarity Plasma Arc Welding;
VPPAW穿孔特性与焊缝成形稳定性的研究及控制
All gas line joints shall be orbital welded except those connecting to valves.
所有气体管路的连接采用无缝焊接。
This paper gives emphasis on discussion of the joint quality assurance and deformation control in internal bore welding at two ends.
本文着重论述双端内孔焊工作中焊缝质量保证及变形控制问题。
Study on the Characteristics and the Porosity of Vertical Welding;
铝合金激光立焊焊接特性及气孔问题研究
