Welding aircraft structures from thick aluminium alloys

Kudryashov, O N; Novikov, O. M.; Алексеев, Ю В; Barabokhin, N S; Sabantsev, A N; Kapralov, V A; Kudryashov, N O; Koryavikhin, E N

doi:10.1080/09507110209549552

Cited by 2 publications

(2 citation statements)

References 2 publications

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“…These alloys are mostly used in aerospace and automobile structural purpose. But traditional reveting process of material comes with stress corrosion and loosening problems [3]. Welding of such alloys is better processed in spite of its inherent problems like tenacious oxide layer, high thermal conductivity, high coefficient of thermal expansion, solidification shrinkage, and high solubility of hydrogen while in liquidus state [4,5].…”

Section: Introductionmentioning

confidence: 99%

Influence of Temperature Profile during Laser Welding of Aluminum Alloy 6061 T6 on Microstructure and Mechanical Properties

Narsimhachary

Bathe

Padmanabham

et al. 2014

Materials and Manufacturing Processes

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In the present study, laser welding was carried out with CO 2 laser on a 2 mm thick aluminum alloy (6061-T6) sheet to study laser weldability of this heat-treatable aluminum alloy. Screening experiments were performed initially to enumerate the power density requirement for proper coupling of the laser with the material. Bead on plate experiments were conducted to recognize situation under which stable keyhole and welds with minimum defects (porosity and cracks) can be produced. Recognized process window (3 kW power, 4 m/min welding speed, and 18 L/min Helium flow rate) obtained from initial trial was used in butt welding experiment and the resulted weld was characterized by macroscopic and microscopic observation, microhardness study, and tensile test. The microstructure reveals porosity and crack-free welds and hardness data confirmed presence of heat-affected zone (HAZ) and huge drop in overall hardness after welding. After post-weld treatment (aging treatment), the hardness was increased marginally, but base hardness could not be achieved. Thermal profile experienced by the material during welding was calculated and it revealed that the mechanical properties of the material decreased due to temperature experienced by the material lead to loss of aging properties of the material.

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Section: Introductionmentioning

confidence: 99%

Influence of Temperature Profile during Laser Welding of Aluminum Alloy 6061 T6 on Microstructure and Mechanical Properties

Narsimhachary

Bathe

Padmanabham

et al. 2014

Materials and Manufacturing Processes

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“…Different types of welding equipment were developed including power sources for pulse-arc welding. They showed themselves good in welding of critical designation structures [3,4]. The main peculiarities of such sources are possibility of smooth regulation of frequency of current pulses from 30 to 300 Hz, duration of pulses 0.5-5.0 ms and amplitude to 850 A.…”

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confidence: 99%

Application of pulse welding power sources in electrochemical processes

Zhernosekov¹,

Kislitsyn²

2015

The Paton Welding J.

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It was determined that area of application of pulse welding power sources for processes of metal flame treatment can be expended. At that continuously rising in price natural gas is substituted by hydrogen-oxygen mixtures or hydrogen. Application of nickel instead of low-carbon steel as electrodes at water electrolysis allowed reducing process voltage to 2.1 V. Dependence of increase of percent content of finer powder fractions (1-50 μm and 1 μm, and less) at increase of frequency of current of anode dissolution was determined. Received results indicate perspectives of investigations in this direction for increase of efficiency of electrochemical processes of hydrogen production as well as micro-and nanopowders for manufacture of welding and brazing powder consumables. Pulse power sources for gas-shielded metal arc welding are widely used in such branches of industry as shipbuilding, chemical-machine building, rocket production, car industry, pipeline construction and many others [1,2]. Frequency of transfer of electrode metal droplets is an important parameter among the different parameters for regulation of process of pulse-arc welding and it usually lies in 30-300 (500) Hz range. Smooth regulation of frequency of welding current pulses allows electrode metal transfer by principle «1 pulse-1 droplet». The E.O. Paton Electric Welding Institute works on development of equipment and technology of pulse-arc processes for a long time. Different types of welding equipment were developed including power sources for pulse-arc welding. They showed themselves good in welding of critical designation structures [3,4]. The main peculiarities of such sources are possibility of smooth regulation of frequency of current pulses from 30 to 300 Hz, duration of pulses 0.5-5.0 ms and amplitude to 850 A.Power sources are used in related technologies, for example, in production of hydrogen-oxygen mixtures for processes of welding, brazing, welding-brazing and operations of flame treatment of metals. Gas generators in indicated processes consist of direct current welding source and electrolytic cell. Possibility of dramatic reduction of consumption of continuously rising in price natural gas and decrease of environment pollution are the advantages of application of hydrogen and hydrogen-oxygen mixtures in flame treatment processes.Besides, one of the variants of significant reduction of costs for welding and brazing consumables are the possibility of in-situ production, for example, of braze pastes of necessary composition with guaranteed quality, by methods of electrochemical dispersion of ferrous, nonferrous and noble metals. Therefore, it is relevant to carry out experimental investigations on increase of efficiency of electrochemical processes due to regulation (increase) of current frequency.The most repeatable in final result processes were selected for performance of experimental investigations of effect of current frequency on some electrochemical processes. First of all, these are the processes essential for power engineerin...

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Welding aircraft structures from thick aluminium alloys

Abstract: To cite this article: O N Kudryashov , O M Novikov , I V Alekseev , N S Barabokhin , A N Sabantsev , V A Kapralov , N O Kudryashov & E N Koryavikhin (2002) Welding aircraft structures from thick aluminium alloys, Welding International, 16:5, 412-414,

Cited by 2 publications

References 2 publications

Influence of Temperature Profile during Laser Welding of Aluminum Alloy 6061 T6 on Microstructure and Mechanical Properties

Influence of Temperature Profile during Laser Welding of Aluminum Alloy 6061 T6 on Microstructure and Mechanical Properties

Application of pulse welding power sources in electrochemical processes

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