Hybrid 4kW fiber laser-GMAW welding of half-inch mild steel
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Thick plates with different gauges have increased their use in various industries such as the shipyard and offshore industries. The arc welding techniques are the common ways to join the thick plates, which usually requires multi-pass and interlayer control. In addition, high heat input during arc welding also leads to the large distortion in the weld. Industries have shown increasing interest in using the hybrid laser-GMAW welding techniques to join different types of thick plates due to their high productivity, low distortion and excellent synergy of laser welding advantages and arc welding advantages. In this study, a 4 kW fiber laser is combined with gas metal arc welding (GMAW) to hybrid welding of half-inch mild steels. A 4 kW fiber laser, which leads a GMAW, is used to join the root of weld groove. Then, the following GMAW fills the groove. By using this welding procedure, the weld with full-penetration is achieved by one pass. In addition, a high-speed CCD camera is used to real-time monitor the welding process. Influences of different welding parameters such as the distance between laser power and GMAW torch and the gap on the weld quality are investigated.Keywords:
Electrogas welding
Welding power supply
The distribution of temperature field in pipeline welding process has important influence to weld quality.In this article,the finite element model is used to simulate 20 steel pipeline butt joint welding process.The welding voltage,the welding speed as well as the heat source effective factor are selected on the simulation under the different welding current to calculate three-dimensional transient temperature field.The temperature cyclic curve of the welding pool and heat-affected zone are obtained simultaneously.The different welding current is input to modify input energy,the best welding current selection range is 720A～800A in the welding.The conclusion has guidance function for the selection of welding process parameter.
Electrogas welding
Welding power supply
Butt welding
Robot welding
Butt joint
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In spot welding of enameled wire to copper foil,selecting the appropriate welding electrodes and controlling the welding energy precisely are very important.In this paper,a special loop structure electrode is used.Three-stage pulse current is exported by the sophisticated inverter welding power supply to do one-side welding experiment.Through precise control of welding process parameters,one-side welding enameled wire to copper foil is realized.The actual welding results showed that inverted welding power supply can control the welding energy precisely to meet the needs of copper and enameled wire welding.
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Spot welding
Cold welding
Electrogas welding
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Process stability is one of the base selection criteria for filler material, shielding gas and optimal welding parameters of the MAG welding. In order to determine influence of filler material and shielding gas selection, computer supported on-line acquisition and processing of main welding parameters (welding voltage and welding current) was performed using developed on-line monitoring system. Besides, during MAG welding process, audible sound signals were monitored. Two types of shielding gas were used: (a) carbon-dioxide and (b) gas mixture of argon (82%) and carbon-dioxide (18%). Welding process was performed with solid and basic flux cored wires. This paper presents results attained by analyse of collected data for MAG welding voltage and welding current, as well as welding process sound signals. Final results are shown in appropriate diagrams: moving average values distribution of welding parameters, as well as welding voltage, welding current and sound signals amplitude as a function of the time.
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Electrogas welding
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Abstract Where single-sided welding is applied to fabrication and erection of piping made of low alloy steels, stainless steels (SS) and nonferrous alloys, back shielding by inert gas and its maintenance for the first few layers is required to obtain good weldability and to prevent oxidation of welds. In order to save consumption of inert gas, isolations to make a chamber for inert gas purging are placed inside piping for the joint and the adjacent areas to be welded, instead of inert gas purging for the whole piping length. However, placing the isolations before welding and removal of them after welding are sometimes impractical due to piping layout and construction sequence such as closure joints. To solve this issue, practices for omission of back shielding, such as use of flux cored welding filler rods for gas tungsten arc welding (GTAW) or high silicon welding wires for gas metal arc welding in modified wave short circuit mode (GMAW-S), had been developed and achieved the objective. These practices, however, require special training and qualifications for welders, close dimensional tolerance for fit-up, and special welding power source equipped with electrical waveform control. Also, welding quality such as remaining slag or spatters on piping internal is sometimes an issue. To make up for these shortcomings, high silicon solid welding filler rod was introduced to stainless steel welding by GTAW to eliminate back shielding, and mock-up tests were conducted. The properties of the welds were studied by comparison to the welds produced by the other welding processes such as GTAW with back shielding, GTAW with flux cored filler rod without back shielding, and GMAW-S using high silicon solid wire without back shielding. This paper discusses and evaluates the potential of the GTAW with high silicon solid filler rod which can eliminate the inert gas back shielding.
Inert gas
Electrogas welding
Welding power supply
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Welding power supply
Butt welding
Electrogas welding
Inert gas
Robot welding
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The Gas Hollow Tungsten Arc (GHTA) welding experiments on aluminum pipe were carried out in a simulated space environment and a ground 1G vacuum environment. The square butt welding joints with non root gap on aluminum pipe were made by orbital welding with filler metal using DC-pulsed power supply in the vacuum chamber under the 10-2G and 1G gravity conditions. The butt welding phenomenon during the aluminum DC-pulsed GHTA welding with filler metal recorded in the high-speed video image were analyzed and also the macrostructure and mechanical properties of the butt weld joints were investigated. As the result, it was clarified that the arc discharge and melting-solidifying process during DC-pulsed GHTA welding were insensitive to the gravity condition, because the welding phenomenon greatly receives the effect of the impulsive arc pressure in pulsed current. And also, the GHTA welding experiments under simulated space environment proved that the DC-pulsed GHTA welding process with filler metal could produce the defect-free aluminum butt welding joints with the enough strength safely.
Butt welding
Welding power supply
Cold welding
Electrogas welding
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To narrate the application and market status of steel structure part:the working of steel structure part welding is big,requirements are high; comparing with manual arc welding,CO2 gas shielded automatic welding can raise efficiency from 3 to 5 times,save welding material 58%,save electricity 43%,it has the characteristics of low welding cost,high efficiency,welding bead good profile,strong operation,and it is used widely. The welding device of CO2 gas shielded automatic welding mainly has welding power,welding machine head,welding vehicle,operating table and so on. The function of each part is analyzed. The parameters of welding voltage,welding current,welding speed,wire feeder velocity etc. are given out. The influence of welding wire stretch,CO2 gas flow,welding wire quality on welding is analyzed. Taking welding crane beam as an example,the welding process such as before welding preparation,welding,welding beam finishing and attention item is explained.
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Robot welding
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To solve the problem existing in welding metallurgy equipment,pressure vessel with the thick wall such as the converter body,a set of feasible scheme of the submerged arc welding is summarized after repeated tests.This paper mainly introduces the issues in the automatic submerged arc welding process of pressure vessel from the aspects of welding groove,selection of welding material,requirements of steel plate before welding,welding parameters and process after welding etc.
Electrogas welding
Robot welding
Welding power supply
Groove (engineering)
Butt welding
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On the basis of increasing welding current and voltage,two new types single wire high penetration MAG welding processes are introduced,these are fine wire high current MAG welding and DCEN MAG welding.The two welding processes are analyzed about welding arc process,metal transfer process and weld forming with high-speed film.The testing results show that selecting suitable shielding gas φ(Ar)98%+φ(O2)2% can obtain steady fine wire high-current MAG welding and DCEN MAG welding.
Welding power supply
Electrogas welding
Penetration (warfare)
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Chapter 1 covers fusion welding processes, including: Illustrations of All Welding Processes (showing both the overall process and the details of the welding area) Advantages and Disadvantages of Each Process Overview (classification of fusion welding processes; effect of power density on weld quality, productivity, and equipment cost; materials commonly welded by each process; types of joints; welding positions) Oxyacetylene Welding (including chemical reactions, flame temperature distribution, and three types of flames: neutral, reducing and oxidizing) Shielded Metal Arc Welding (including four functions of electrode covering: protection, deoxidation, arc stabilization, and metal addition) Gas-Tungsten Arc Welding (including effect of shielding gas and three types of polarity: DCEN, DCEP and AC) Plasma Arc Welding (including arc initiation, melt-in mode and keyholing mode) Gas-Metal Arc Welding (including effect of shielding gas, and three types of metal transfer: globular, spray and short-circuit) Flux-Core Arc Welding Submerged Arc Welding Electroslag Welding Deposition Rates of All Processes Above Electron Beam Welding (including effect of ambient pressure on beam dispersion) Laser Beam Welding (including CO2, YAG and diode lasers, reflectivity, effect of shielding gas, and laser-assisted arc welding) 31 Illustrations, 26 References, and 11 Exercise Problems Friction stir welding is covered in Chapter 15.
Welding power supply
Fusion welding
Plasma arc welding
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