Influence of welding parameters on pit initiation and pit growth in welded joints of X5CrNi18-10 stainless steel

2018 ◽  
Vol 63 (1) ◽  
pp. 167-179 ◽  
Author(s):  
Bore V. Jegdić ◽  
Biljana M. Bobić ◽  
Bojana M. Radojković ◽  
Behar Alić
Keyword(s):  
Stainless Steel ◽  
Welded Joints ◽  
Welding Parameters ◽  
Pit Initiation

scholarly journals Modeling of Bending Properties of Stainless Steel 304 Sheets Welded by Tungsten Inert Gas Welding Process

2019 ◽  
Vol 15 (4) ◽  
pp. 10-22
Author(s):  
Ali Hussein Alwan
Keyword(s):  
Stainless Steel ◽  
Welded Joints ◽  
Gas Pressure ◽  
Inert Gas ◽  
Welding Parameters ◽  
Tungsten Inert Gas Welding ◽  
Bending Properties ◽  
Argon Gas ◽  
Bending Force ◽  
Stainless Steel 304

In this research, the effects of both current and argon gas pressure on the bending properties of welded joints were studied. Using the possible ranges of welding gas pressures and currents, Tungsten inert gas welding (TIG) of stainless steel (304) sheet was used to obtain their influence on the maximum bending force of the (TIG) welded joints. Design of experiment (DOE) ‘version 10' was used to determine the design matrix of experiments depending on the used levels of the input factors. Response surface methodology (RSM) technique was used to obtain an empirical mathematical model for the maximum bending force as a function of welding parameters (Current and Argon gas pressure). Also, the analysis of variance (ANOVA) was used to verify the adequacy of the resulted model statistically.  

scholarly journals The effect of welded joint properties on the surface characteristics of laser-welded 2205 duplex stainless steel

2018 ◽  
Vol 10 (9) ◽  
pp. 168781401879744 ◽  
Author(s):  
Shanshan Hu ◽  
Dongrui Zheng ◽  
Guolin Zhao ◽  
Guangliang Li ◽  
Hongqun Tang
Keyword(s):  
Tensile Strength ◽  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Surface Quality ◽  
Welded Joints ◽  
Welded Joint ◽  
Surface Characteristics ◽  
Welding Parameters ◽  
Joint Properties ◽  
Welding Surface

Welded joints of poor welding surface quality are sensitive to stress concentrations, affecting both the tensile strength of workpieces and the fluidity of liquids and gases in pressure and liquid containers. Orthogonal experiments involving the laser welding of 1-mm-thick duplex stainless steel sheets were conducted using different electric current, pulse width and frequency values in order to analyse the effect of welding properties on the surface characteristics of the welded joints. Rapid judgement regarding the welded joint properties was made based on the observed welding surface quality. The results show that an even phase proportion and grain refinement are not necessarily guaranteed to provide good welding surface quality. A satisfactory welding surface quality characterised by a smaller spot pitch or spot pitch difference, smaller weld width, reduced surface roughness and valley depth of surface waviness implies better welded joint mechanical characteristics and a more even microstructure. The specimen with the most suitable welding parameters and the greatest heat input can reach the lowest volume fraction of ferrite phase of 42.5% and the highest tensile strength of 848 MPa, and its surface quality is the best.

scholarly journals Influence of Parameters of Laser Beam Welding on Structure of 2205 Duplex Stainless Steel

2019 ◽  
Vol 19 (1) ◽  
pp. 21-31 ◽  
Author(s):  
M. Landowski
Keyword(s):  
Stainless Steel ◽  
Laser Beam ◽  
Laser Welding ◽  
Duplex Stainless Steel ◽  
Welded Joints ◽  
Laser Beam Welding ◽  
Welding Parameters ◽  
Processing Technologies ◽  
High Level ◽  
The Impact

AbstractLaser welding is used in modern industry, having many advantages comparing to traditional welding technologies. Nowadays, industry sectors such as shipbuilding, automotive and aviation can’t be imagined without laser processing technologies. Possibility of increase of welded joint properties, autogenous welding and high level of process automation makes the technology of laser welding perspective part of the industry. Physical multidimensional processes complexity requires a deeper understanding of the impact of laser welding parameters on the quality of welded joints for industrial implementation. The paper presents results of microstructure investigations of laser beam welded stainless steel under various welding parameters. Welded joints was achieved by Ytterbium fiber laser type without the use of the filler material. Material for test was 2205 ferritic-austenitic duplex stainless steel (DSS) plates with thickness of 8 mm in delivery condition. The objectives of this research was to investigate influence of laser welding parameters on weld geometry of butt-welded joints. Investigations of bead shape revealed correlation between laser beam focus position and weld penetration depth.

Development of Technological Recommendations for Improving the Quality of Welded Joints of Pipeline System Elements Made of Stainless Alloys for Aviation Purposes

2021 ◽  
pp. 41-53
Author(s):  
A.S. Kravchenko ◽  
P.V. Bakhmatov
Keyword(s):  
Stainless Steel ◽  
Welded Joints ◽  
Arc Welding ◽  
Welding Parameters ◽  
Pipeline System ◽  
Welding Equipment ◽  
Pipeline Systems ◽  
Single Production ◽  
Thin Walled

There is a substantial body of literature on improving the quality of welded joints of stainless steels. However, as practice shows, in a single production facility the level of defects can be quite high, which can be explained by the specifics and features of this production. Currently, there is insufficient information about the optimal modes of argon arc welding of thin-walled stainless steel pipe systems. The welding modes given in the current regulatory documentation are not always relevant and optimal for modern welding equipment. In addition, there is no model to predict the change in the mechanical properties of the weld depending on the welding parameters. This leads to the need to carry out a series of laborious experiments for each new alloy or piece of welding equipment in order to build diagrams that allow you to determine the range of parameters for obtaining the best quality welded joints. This study examines the influence of argon arc welding on the structure and properties of welded joints of thin-walled stainless steel elements of pipeline systems. A linear regression model is obtained that reflects the dependence of the tensile strength of the welded joints on the argon arc welding mode. Technological recommendations for manufacturing welded elements for stainless steel pipeline systems for aviation purposes are developed.

Estimation of Some Mechanical Properties for Similar & Dissimilar Welded Joints

2014 ◽  
Vol 2 (1) ◽  
pp. 59-76
Author(s):  
Abdullah Daie'e Assi
Keyword(s):  
Stainless Steel ◽  
Carbon Steel ◽  
Austenitic Stainless Steel ◽  
Base Metal ◽  
Welded Joints ◽  
Plate Thickness ◽  
Low Carbon Steel ◽  
Dissimilar Metals ◽  
Low Carbon ◽  
Steel Type

This research deals with the choice of the suitable filler metal to weld the similar and dissimilar metals (Low carbon steel type A516 & Austenitic stainless steel type 316L) under constant conditions such as, plate thickness (6 mm), voltage (78 v), current (120 A), straight polarity. This research deals with three major parts. The first parts Four types of electrodes were used for welding of dissimilar metals (C.St A516 And St.St 316L) two from mild steel (E7018, E6013) and other two from austenitic stainless steel (E309L, E308L) various inspection were carried out include (Visual T., X-ray T., δ- Ferrite phase T., and Microstructures T.) and mechanical testing include (tensile T., bending T. and micro hardness T.) The second parts done by used the same parameters to welding similar metals from (C.St A516) Or (St.St 316L). The third parts deals with welding of dissimilar weldments (C.St And St.St) by two processes, gas tungsten are welding (GTAW) and shielded metal are welding (SMAW).        The results indicated that the spread of carbon from low carbon steel to the welding zone in the case of welding stainless steel elect pole (E309L) led to Configuration Carbides and then high hardness the link to high values ​​compared with the base metal. In most similar weldments showed hardness of the welding area is  higher than the hardness of the base metal. The electrode (E309L) is the most suitable to welding dissimilar metals from (C.St A516 With St.St 316L). The results also showed that the method of welding (GTAW) were better than the method of welding (SMAW) in dissimilar welded joints (St.St 316L with C.St A516) in terms of irregular shape and integrity of the welding defects, as well as characterized this weldments the high-lift and resistance ductility good when using the welding conditions are similar.

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