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Full-Text Articles in Social and Behavioral Sciences
Towards An Automated Robotic Arc-Welding-Based Additive Manufacturing System From Cad To Finished Part, Donghong Ding, Chen Shen, Zengxi Stephen Pan, Dominic Cuiuri, Hui Jun Li, Nathan P. Larkin, Stephen Van Duin
Towards An Automated Robotic Arc-Welding-Based Additive Manufacturing System From Cad To Finished Part, Donghong Ding, Chen Shen, Zengxi Stephen Pan, Dominic Cuiuri, Hui Jun Li, Nathan P. Larkin, Stephen Van Duin
Faculty of Engineering and Information Sciences - Papers: Part A
Arc welding has been widely explored for additive manufacturing of large metal components over the last three decades due to its lower capital cost, an unlimited build envelope, and higher deposition rates. Although significant improvements have been made, an arc welding process has yet to be incorporated in a commercially available additive manufacturing system. The next step in exploiting "true" arc-welding-based additive manufacturing is to develop the automation software required to produce CAD-to-part capability. This study focuses on developing a fully automated system using robotic gas metal arc welding to additively manufacture metal components. The system contains several modules, including …
Experimental Investigation Of Welding Stresses In Mwic Weldability Test, Houman Alipooramirabad, Anna Paradowska, Reza Ghomashchi, Nicholas P. Hoye, Mark H. Reid
Experimental Investigation Of Welding Stresses In Mwic Weldability Test, Houman Alipooramirabad, Anna Paradowska, Reza Ghomashchi, Nicholas P. Hoye, Mark H. Reid
Faculty of Engineering and Information Sciences - Papers: Part A
The use of high-strength steels in the manufacture of energy pipelines, coupled with the transition to larger pipe diameters and greater wall thicknesses, has led to an increased potential for cracking including hydrogen assisted cracking of energy pipelines due to higher constraint induced stresses. In the present study, a modified version of the Welding Institute of Canada (MWIC) restraint test was used to simulate the constraint conditions of full-scale girth welds on energy pipelines, allowing the influence of welding process parameters on crack formation to be assessed. MWIC test samples of X70 grade high-strength low alloy pipeline steel were manually …
A Round-Robin Test With Thermal Simulation Of The Welding Haz To Draw Cct Diagrams: A Need For Harmonized Procedures And Microconstituent Terminologies, Americo Scotti, Huijun Li, Rosa M. Miranda
A Round-Robin Test With Thermal Simulation Of The Welding Haz To Draw Cct Diagrams: A Need For Harmonized Procedures And Microconstituent Terminologies, Americo Scotti, Huijun Li, Rosa M. Miranda
Faculty of Engineering and Information Sciences - Papers: Part A
Thermal simulations of heat affected zone (HAZ) have been widely used. This is an economic expedite process for phase transformation evaluations in steels when subjected to weld thermal cycles as well as to draw continuous cooling transformation (CCT) diagrams. Different approaches for the simulation and parameter settings have been used by several researchers, yet leading to not always even results. Thus, it was proposed a round-robin test trial performed by different laboratories, aiming to evidence potential sources of error or inadequacy of the approaches. A High Strength Low Alloy (HSLA) steel was used as a case study. Despite the limited …
Weld-End Solidification Cracking In Pulsed-Tandem Gas Metal Arc Welding Of Naval Steels, Zoran Sterjovski, C Bayley, J Donato, Nathan Lane, D Lang
Weld-End Solidification Cracking In Pulsed-Tandem Gas Metal Arc Welding Of Naval Steels, Zoran Sterjovski, C Bayley, J Donato, Nathan Lane, D Lang
Faculty of Engineering and Information Sciences - Papers: Part A
Pulsed tandem gas metal arc welding (PT-GMAW) has the potential to increase productivity and minimize distortion in the fabrication of naval surface ship panels. In this study, the PT-GMAW process was used in pulse-pulse mode to butt joint weld 5-mm DH36,8-mm HSLA65, 9.5-mm 350WT, and 11-mm HSLA65 steel plate with ER70S-6 wire in order to assess its suitability as a replacement for submerged arc welding (SAW) and gas metal arc welding (GMAW) in panel lines of Australian naval shipyards. In the pulse-pulse mode, the wire feed rates for the leading and trailing welding wires are set independently and they alternately …
A Validated Thermo Mechanical Fem Model Of Bead-On-Plate Welding, Djarot Darmadi, A Kiet Tieu, John Norrish
A Validated Thermo Mechanical Fem Model Of Bead-On-Plate Welding, Djarot Darmadi, A Kiet Tieu, John Norrish
Faculty of Engineering and Information Sciences - Papers: Part A
This paper is presenting accurate FEM model of bead-on-plate welds of 316L stainless steels through thermo-mechanical analysis. The model was composed using ANSYS Parametric Design Language (APDL) program. In thermal analysis, mixed mode of volumetric thermal load was used to represent moving heat source. Growing weld bead was accommodated in both the thermal and mechanical models using birth and death technique. Melting phenomenon was modelled by low stiffness and zero plastic strain of melting elements. Results from thermal analysis and subsequent mechanical analysis have been validated. Good agreements of predicted temperature histories, temperature field and residual stress with experimental results …
Development Of Safe Optimized Welding Procedures For High Strength Q&T Steel Welded With Austenitic Consumables, Lenka Kuzmikova, Huijun Li, John Norrish, Zengxi Stephen Pan, Nathan Larkin
Development Of Safe Optimized Welding Procedures For High Strength Q&T Steel Welded With Austenitic Consumables, Lenka Kuzmikova, Huijun Li, John Norrish, Zengxi Stephen Pan, Nathan Larkin
Faculty of Engineering and Information Sciences - Papers: Part A
High strength quenched and tempered (Q&T) steels offer obvious economic benefits originating from their advantageous strength to price and weight ratios. These steels are usually welded using ferritic consumables and for this combination the risk of hydrogen assisted cold cracking (HACC) is high. The use of austenitic stainless steel (ASS) consumables has great potential to significantly improve this issue. Yet, there are no guidelines for determination of safe level of preheat for welding ferritic steels with ASS consumables. For this reason manufacturers adopt this parameter from procedures developed for conventional ferritic consumables thus significantly limiting the benefits ASS consumables are …
Additive Manufacture Of Titanium Alloys Using Integrated Robotic Gtaw Welding, John Norrish, Dominic Cuiuri
Additive Manufacture Of Titanium Alloys Using Integrated Robotic Gtaw Welding, John Norrish, Dominic Cuiuri
Faculty of Engineering and Information Sciences - Papers: Part A
Additive manufacturing (also known as rapid prototyping, shape metal deposition or near net manufacture ) is becoming an important option for low volume production of complex parts. Much of the recent effort has been devoted to laser based processes using powder feedstock and 3D printing techniques; these techniques are well suited to producing smaller complex structures in a wide range of materials. The current paper describes a technique for cold wire GTAW deposition of titanium alloys using robotic welding and integrated post weld machining; the approach is suitable for producing much larger parts. The techniques involved and resultant weld quality …
Investigation Into Feasibility Of Hybrid Laser-Gmaw Process For Welding High Strength Quenched And Tempered Steel, Lenka Kuzmikova, Nathan Larkin, Zengxi Pan, Mark Callaghan, Huijun Li, John Norrish
Investigation Into Feasibility Of Hybrid Laser-Gmaw Process For Welding High Strength Quenched And Tempered Steel, Lenka Kuzmikova, Nathan Larkin, Zengxi Pan, Mark Callaghan, Huijun Li, John Norrish
Faculty of Engineering and Information Sciences - Papers: Part A
In this study, the feasibility of hybrid laser-gas metal arc welding process for replacement of conventional flux-cored arc welding procedure for welding high strength quenched and tempered steel was investigated. Experimental work focused on optimisation of process parameters to produce joint with desired properties. Hardness of the weld heat affected zone produced by both processes has been measured. Productivity and cost effectiveness of both processes were compared. It was concluded that hybrid laser-gas metal arc welding process is suitable for welding high strength quenched and tempered steel.
Optimization Of Welding Parameters For Repairing Nial Bronze Components, Huijun Li, Daniel Grudgings, Nathan P. Larkin, John Norrish, Mark Callaghan, Lenka Kuzmikova
Optimization Of Welding Parameters For Repairing Nial Bronze Components, Huijun Li, Daniel Grudgings, Nathan P. Larkin, John Norrish, Mark Callaghan, Lenka Kuzmikova
Faculty of Engineering and Information Sciences - Papers: Part A
The objective of this study is to determine an optimal welding procedure that can be implemented to repair damaged Nickel Aluminium Bronze (NAB) components. NAB is commonly used in marine applications where components are subject to a constant corrosive environment and high stresses. Research into ideal NAB microstructure for a marine application, was performed in order to gain a baseline for experimental analysis of potential welding procedures. The results indicated that the welding repair can be performed with a wide range of heat input. The effect of post-weld heat treatment (PWHT) on the microstructure and mechanical properties in the heat …
Investigation On Welding Arc Interruptions In The Presence Of Magnetic Fields: Arc Length, Torch Angle And Current Pulsing Frequency Influence, Ruham Pablo Reis, Americo Scotti, John Norrish, Dominic Cuiuri
Investigation On Welding Arc Interruptions In The Presence Of Magnetic Fields: Arc Length, Torch Angle And Current Pulsing Frequency Influence, Ruham Pablo Reis, Americo Scotti, John Norrish, Dominic Cuiuri
Faculty of Engineering and Information Sciences - Papers: Part A
Arc interruptions have been observed in tandem pulsed gas metal arc welding (GMAW). This fact, which is likely related to magnetic interaction between the arcs, motivated previous study concerning the influence of the welding current on this phenomenon. In order to promote further understanding, this paper investigates the effects of arc length, torch angle, and high-frequency current pulsing on the arc resistance to extinction. To mimic the situation found in tandem GMAW (magnetic field induced by one arc acting on the other arc), external magnetic fields were applied to gas tungsten arc welding arcs. It was verified that short arc …
Bonding Of Mg-Base Metallic Glass Through Rapid Resistive Welding, Karl F. Shamlaye, Kevin J. Laws, Bob De Jong, Michael Ferry
Bonding Of Mg-Base Metallic Glass Through Rapid Resistive Welding, Karl F. Shamlaye, Kevin J. Laws, Bob De Jong, Michael Ferry
Faculty of Engineering and Information Sciences - Papers: Part A
Efficient joining of Magnesium-base bulk metallic glass can be achieved via bonding through resistance welding using rapid heating rates. Bonding of Mg-base metallic glasses (as well as regular magnesium alloys) is a process hindered by the ease of oxide formation in these materials. In this work, resistance welding of Mg65Cu25Y10 metallic glass sheets was investigated up to 627 K , below the liquidus temperature; and also within the supercooled liquid region (443-483 K) of the metallic glass; during processing times of a few seconds, creating strong joins -even when processed in air. It is seen that a fluxing pre-treatment of …
Sensitization Behaviour Of 11-12% Cr Aisi 409 Stainless Steel During Low Heat Input Welding, Cornelis Janise Van Niekerk, Madeleine Du Toit
Sensitization Behaviour Of 11-12% Cr Aisi 409 Stainless Steel During Low Heat Input Welding, Cornelis Janise Van Niekerk, Madeleine Du Toit
Faculty of Engineering and Information Sciences - Papers: Part A
The study comprised of the investigation into the sensitization characteristics of AISI 409 titanium stabilized ferritic stainless steel during low heat input welding. AISI 409 is a fully ferritic stainless steel used in catalytic converters and tubing for automotive exhaust systems due to the supposition that sensitization does not occur during low heat input welding. Two plates of 2 and 4 mm were tested for sensitization during low heat input welding. The study confirmed that chromium carbide (M23C6) precipitation occurs on the grain boundaries in the heat-affected zone with consequent depletion of Cr adjacent to the …
Offline Programming For Short Batch Robotic Welding, Nathan Larkin, Aleksandar Milojevic, Zengxi Pan, Joseph Polden, John Norrish
Offline Programming For Short Batch Robotic Welding, Nathan Larkin, Aleksandar Milojevic, Zengxi Pan, Joseph Polden, John Norrish
Faculty of Engineering and Information Sciences - Papers: Part A
Robotics based automation has many advantages over both manual operation and dedicated hard automation. In practice however the robot programming overhead and high cost of dedicated jigging are serious impediments to its use for short production runs. Offline programming packages offer an attractive alternative to reduce programming time and robot down time, however many of the available packages are fairly complex and treat the geometric programming and welding operation separately. The paper will describe the development of alternative approaches and the evaluation of an integrated offline robotic welding package (RinasWeld) which addresses these issues and makes low volume robotic welding …
Research To Establish A Systematic Approach To Safe Welding Procedure Development Using Austenitic Filler Material For Fabrication Of High Strength Steel, Lenka Kuzmikova, John Norrish, Huijun Li, Mark Callaghan
Research To Establish A Systematic Approach To Safe Welding Procedure Development Using Austenitic Filler Material For Fabrication Of High Strength Steel, Lenka Kuzmikova, John Norrish, Huijun Li, Mark Callaghan
Faculty of Engineering and Information Sciences - Papers: Part A
High strength, thermo-mechanically treated steels often require very careful control of welding procedures to ensure freedom from hydrogen assisted cold cracking (HACC) in the weld metal and heat affected zone (HAZ) whilst avoiding undue loss of heat affected zone strength. In practice this leads to restricted operating envelopes and the requirement for rigorous procedure management. An alternative approach is the use of austenitic welding consumables but whilst this may be expected to expand the process parameter envelope its use is often restricted by adherence to procedures previously developed for ferritic consumables. The current paper describes the research undertaken to establish …
Development Of A Dc-Lsnd Welding Process For Gmaw On Dh-36 Steel, Raymond Holder, Nathan Larkin, Huijun Li, Lenka Kuzmikova, Zengxi Pan, John Norrish
Development Of A Dc-Lsnd Welding Process For Gmaw On Dh-36 Steel, Raymond Holder, Nathan Larkin, Huijun Li, Lenka Kuzmikova, Zengxi Pan, John Norrish
Faculty of Engineering and Information Sciences - Papers: Part A
Weld induced distortion correction is a major cost within the shipbuilding industry. This paper investigates the use of an active cooling process known as Dynamically Controlled - Low Stress No Distortion (DC-LSND) Welding on DH-36 steel. Thermal profiles are obtained and distortion measurements are also achieved. Results show that the application of a localised cryogenic cooling source trailing the welding arc can significantly reduce weld induced distortion using the GMAW process. The effect of forced cooling on the weld microstructure is also observed.