Welding Defects and Implications on Welded Assemblies

Yusof, Farazila; Jamaluddin, Mfh

doi:10.1016/b978-0-08-096532-1.00605-1

Cited by 18 publications

(10 citation statements)

References 46 publications

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“…The It also shows the porosity defects in the joint results using currents of 100 A and 120 A and this is following the results of the previous radiographic tests. This porosity is caused by the diffusion of hydrogen during the welding process [25], According toAWS D 1.2, [26] the greatest number of defects must not exceed 2 mm, as long as 25 mm must not exceed 10 mm. 4.…”

Section: Analysis Of Defects and Macrostructuresmentioning

confidence: 99%

Effect of Current on Mechanical Properties and Microstructure of Aluminum 6061 with Gas Tungsten Arc Welding Process

Tarmizi¹,

Sianturi

Irfan³

2020

Kapal

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Aluminum 6061 is an aluminum alloy that is widely used in various industrial fields, which heat treatable. However, it can be joined using a welding process. Aluminum joining using the Gas Tungsten Arc Welding (GTAW) process has become the option to produce good quality joints. This research aims to get optimum welding parameters by knowing the mechanical properties and microstructure of the welding results. The GTAW process uses a 25-volt voltage, Argon protective gas flow rate of 15 liters per minute with filler rod ER 5356 with 2.4 mm diameter and electrodes tungsten 2.4 mm in diameter. This process uses a single V butt joint and groove angle of 60° with variations in the current of 100, 110 and 120 A. The results indicate that specimens with a variety of current of 110 A give better results in the absence of defects, have a tensile strength of 152 MPa, and get a hardness value of 87.55 HV, which is the highest compared to the other two specimens. Whereas specimens with the current variation of 100 and 120 A have defects in the weld area. The optimum parameters of the 6061 aluminum GTAW process with a thickness of 6 mm using a current of 110 A bring on better outcomes and mechanical properties than the use of currents of 100 and 120 A.

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Section: Analysis Of Defects and Macrostructuresmentioning

confidence: 99%

Effect of Current on Mechanical Properties and Microstructure of Aluminum 6061 with Gas Tungsten Arc Welding Process

Tarmizi¹,

Sianturi

Irfan³

2020

Kapal

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“…Non-Destructive Testing (NDT) techniques have gained the interest of researchers due to their ability of detecting welding defects [ 11 ]. Despite traditional inspection techniques, the quality of additively manufactured or welded components can be evaluated cost efficiently and in real time using NDT methods so that the examined workpiece is not harmed [ 11 , 12 , 13 , 14 ]. Several NDT techniques are currently available, however, most of them are not applicable for real-time and automatic process monitoring for weld defect inspection in WAAM and fusion welding [ 9 ].…”

Section: Introductionmentioning

confidence: 99%

A Review of Non-Destructive Testing (NDT) Techniques for Defect Detection: Application to Fusion Welding and Future Wire Arc Additive Manufacturing Processes

et al. 2022

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In Wire and Arc Additive Manufacturing (WAAM) and fusion welding, various defects such as porosity, cracks, deformation and lack of fusion can occur during the fabrication process. These have a strong impact on the mechanical properties and can also lead to failure of the manufactured parts during service. These defects can be recognized using non-destructive testing (NDT) methods so that the examined workpiece is not harmed. This paper provides a comprehensive overview of various NDT techniques for WAAM and fusion welding, including laser-ultrasonic, acoustic emission with an airborne optical microphone, optical emission spectroscopy, laser-induced breakdown spectroscopy, laser opto-ultrasonic dual detection, thermography and also in-process defect detection via weld current monitoring with an oscilloscope. In addition, the novel research conducted, its operating principle and the equipment required to perform these techniques are presented. The minimum defect size that can be identified via NDT methods has been obtained from previous academic research or from tests carried out by companies. The use of these techniques in WAAM and fusion welding applications makes it possible to detect defects and to take a step towards the production of high-quality final components.

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“…The depth of removed material should also be inspected with a suitable gauge. Depth scratches parallel to the length of the weld should not be accepted by the inspector and a smooth transition between the weld and the metallic base is expected [80,83,209].…”

Section: Grinding Methodsmentioning

confidence: 99%

“…Fatigue cracking in these cases often starts from micro-cracks around the holes, resulting from the operation of drilling or prompted by corrosion development. The typical causes for fatigue failure in bolted/riveted structures are [80][81][82][83] Welded joints are generally critical due to their susceptibility to stress concentration and residual stresses. Discontinuities linked to the execution of welding, particularly induced defects and heterogeneities in the microstructure.…”

mentioning

confidence: 99%

“…Fatigue cracking in these cases often starts from micro-cracks around the holes, resulting from the operation of drilling or prompted by corrosion development. The typical causes for fatigue failure in bolted/riveted structures are [80][81][82][83] Stress concentrations are linked to the fabrication process, geometry and design. Poor design can increase stress concentrations in a given region increasing its susceptibility to fatigue cracking.…”

mentioning

confidence: 99%

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Corrosion Protection Systems and Fatigue Corrosion in Offshore Wind Structures: Current Status and Future Perspectives

Price

Figueira

2017

Coatings

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Concerns over reducing CO 2 emissions associated with the burning of fossil fuels in combination with an increase in worldwide energy demands is leading to increased development of renewable energies such as wind. The installation of offshore wind power structures (OWS) is one of the most promising approaches for the production of renewable energy. However, corrosion and fatigue damage in marine and offshore environments are major causes of primary steel strength degradation in OWS. Corrosion can reduce the thickness of structural components which may lead towards fatigue crack initiation and buckling. These failure mechanisms affect tower service life and may result in catastrophic structural failure. Additionally, environmental pollution stemming from corrosion's by-products is possible. As a result, large financial investments are made yearly for both the prevention and recovery of these drawbacks. The corrosion rate of an OWS is dependent on different characteristics of attack which are influenced by access to oxygen and humidity. Structural degradation can occur due to chemical attack, abrasive action of waves, and microorganism attacks. Inspired by technological and scientific advances in recent years, the purpose of this paper is to discuss the current protective coating system technologies used to protect OWS as well as future perspectives.

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Welding Defects and Implications on Welded Assemblies

Cited by 18 publications

References 46 publications

Effect of Current on Mechanical Properties and Microstructure of Aluminum 6061 with Gas Tungsten Arc Welding Process

Effect of Current on Mechanical Properties and Microstructure of Aluminum 6061 with Gas Tungsten Arc Welding Process

A Review of Non-Destructive Testing (NDT) Techniques for Defect Detection: Application to Fusion Welding and Future Wire Arc Additive Manufacturing Processes

Corrosion Protection Systems and Fatigue Corrosion in Offshore Wind Structures: Current Status and Future Perspectives

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