耐硫酸露点腐蚀用NS1钢的开发和应用

新开发的耐硫酸露点腐蚀用ＮＳ１钢（≤０．１４Ｃ，０．５￣１．０Ｃｒ，０．２５￣０．５０Ｃｕ，≤０．１５Ｔｉ，≤０．１５Ｓｂ），具有良好的耐硫酸露点腐蚀性能和焊接性能，已广泛应用于石油化工等领域。     

Spot weldability of TRIP assisted steels with high carbon and aluminium contents

Abstract

We examine here the spot welding characteristics of transformation induced plasticity assisted steels, which contain δ-ferrite as a consequence of their aluminium concentrations of 3·5 or 5·6 wt-% and which also have high carbon contents of 0·3 or 0·4 wt-% when compared with conventional automotive steels. The resistance spot welds are tested in both shear and cross-tensile tests in order to determine the so called ductility ratio, which is a parameter associated with the fitness of such welds for automotive applications. With an increase in the δ-ferrite fraction from 0·19 to 0·5, the hardness variation across the weld and heat affected zone is decreased approximately from 400 to 150 HV. It seems that the presence of stable δ-ferrite is helpful in reducing hardness variations and in achieving a significant ductility ratio of 0·39.     

Numerical and experimental study of the microstructural evolution and the properties of joints welded on rebars using the GMAW process

This paper is a study of CA-50 rebars from SAE steel grade 1026. This study was carried out in order to improve the control of the mechanical properties of welded joints. Knowing certain variables are very important when it comes to finding the ideal welding parameters and the respective microstructural results, and consequently for the mechanical properties of welded joints. In order to carry out this study, a study of the material as received was carried out in order to establish a solid basis for comparison. The material was welded using argon as the shielding gas with 20% carbon dioxide. The wire used was copper-covered ER70S-6, and the welded joints were lap joints. The temperature was monitored using thermocouples for two different heat inputs. A numerical computer code was developed to simulate the phenomena that occur during the process (temperature gradient, phase transformations and heat transfer). The welded joints did not introduce martensite as a brittle phase, the weld metal had a dendritic structure, the heat-affected zone (HAZ) had two different zones with different grain sizes. All of this was due to the temperature gradient, which also led to different characteristics in the weld bead, HAZ, phases formed and different grain sizes.     

窑托轮焊接修复

着重分析窑托轮的可焊性 ,并制定了科学的施工方案     

新型铁铜合金触桥材料

铁铜合金是一种可沉淀强化的铜合金,对含 Fe 1.0～3.0％的铁铜合金经合适的热处理工艺,可使得强化相均匀分布在基体上,从而具有较好的机械、物理和焊接性能。本文介绍铁铜合金的研制过程,及其所具有的机械、物理和焊接性能。采用冷冲工艺生产的触桥,产品就可符合技术性能要求。     

Influence of gas mixtures Ar-He and Ar-He-O2 on weldability of aluminum alloy AA5083-O using automated GMAW-P

Problems of industries and manufacturers of welded structures in aluminium alloys are centred on reduction of mechanical properties in welded joints due to heat input effects on the heat affected zone; as well as effects of discontinuities and metallurgical defects, high cost repairs, and low productivity. The aim of this paper is to evaluate the influence of gas mixtures 80Ar20He (MG1), 60Ar40He (MG2), 80Ar19He1O₂ (MG3), and 60Ar39He1O₂ (MG4), on aluminium alloy AA5083-O weldability using filler metal ER5183 using the automated GMAW-P process. Methodology has included a factorial experiment design, customisation of welding parameters, and characterisation of base metal and welding regions. Analysis of results were carried out based on microstructure evaluation of welding regions, measurements of hardness and tensile properties, observations of discontinuities and defects, costs evaluation, and welding speed. Results show that gas mixtures with O₂ are highly beneficial to obtain good weldability of the studied alloy.     

Study of the elaboration of a practical weldability window in magnetic pulse welding

This work investigates the elaboration of a weldability window of an aluminium alloy 6060T6 tubular assembly welded by magnetic pulse welding. A destructive test is used to characterize the weld quality. The fractographic analysis of the fracture surface combined with the analysis of the macrographic section of the welded joint allows characterizing two typical weld cases: a potentially permanent weld enabling to undergo plastic deformation and a weld with interfacial discontinuous voids. The presentation of the weld variance in a charging voltage–air gap width diagram gives an operative welding range. The analysis of the impact velocity isovalues in this diagram allows understanding the shape of the weldability window which is potentially convex. The measurement of the wave height at the interface of the welded joint corroborates the qualitative weldability window.     

圆锥破碎机定锥焊接

探讨分析了圆锥破碎机定锥的可焊性，确定了焊接工艺及采取消除焊接残余应力的措施。     

钛与钢及钛复合钢板的焊接性研究(Ⅰ)

分析了钛钢直接熔焊的焊接特点,焊缝的组织和相组成,论述了钛钢熔焊焊缝脆裂的机理,提出了钛钢焊接的途径。     

WH80钢板的焊接性试验研究

本文从理论上分析了WH80钢的焊接性．选用几种常用的可焊性试验方法对该钢的焊接接头性能进行了评定．并对制作钢结构的焊接工艺提出了要求。