Investigation on the Welding of High-Strength Aluminum Alloys PDF Download
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Author: M. I. Jacobson
Publisher:
ISBN:
Category :
Languages : en
Pages : 27
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Book Description
The objective of this research was to develop methods for improving welded joints in high-strength aluminum alloys. Details of the work done during the period March 1, 1951, to March 31, 1952, on the analysis of wrought aluminum alloys for hydrogen are presented. A summary of the work done during the same period on modified aluminum-magnesium filler metals, welding of ballistic test specimens, and ultrasonic vibration of weld metal is also presented. A method of determining the hydrogen content of wrought aluminum alloys with a precision of + or 1 0.1 ml per 100 grams was developed. The external and internal hydrogen contents of samples of six commercial alloys were determined. In general, the amount of internal hydrogen was much less than that of the external hydrogen.
Author: M. I. Jacobson
Publisher:
ISBN:
Category :
Languages : en
Pages : 27
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Book Description
The objective of this research was to develop methods for improving welded joints in high-strength aluminum alloys. Details of the work done during the period March 1, 1951, to March 31, 1952, on the analysis of wrought aluminum alloys for hydrogen are presented. A summary of the work done during the same period on modified aluminum-magnesium filler metals, welding of ballistic test specimens, and ultrasonic vibration of weld metal is also presented. A method of determining the hydrogen content of wrought aluminum alloys with a precision of + or 1 0.1 ml per 100 grams was developed. The external and internal hydrogen contents of samples of six commercial alloys were determined. In general, the amount of internal hydrogen was much less than that of the external hydrogen.
Author: Rajiv S. Mishra
Publisher: Butterworth-Heinemann
ISBN: 0128094605
Category : Technology & Engineering
Languages : en
Pages : 122
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Book Description
Friction Stir Welding of High Strength 7XXX Aluminum Alloys is the latest edition in the Friction Stir series and summarizes the research and application of friction stir welding to high strength 7XXX series alloys, exploring the past and current developments in the field. Friction stir welding has demonstrated significant benefits in terms of its potential to reduce cost and increase manufacturing efficiency of industrial products in transportation, particularly the aerospace sector. The 7XXX series aluminum alloys are the premium aluminum alloys used in aerospace. These alloys are typically not weldable by fusion techniques and considerable effort has been expended to develop friction stir welding parameters. Research in this area has shown significant benefit in terms of joint efficiency and fatigue performance as a result of friction stir welding. The book summarizes those results and includes discussion of the potential future directions for further optimization. - Offers comprehensive coverage of friction stir welding of 7XXX series alloys - Discusses the physical metallurgy of the alloys - Includes physical metallurgy based guidelines for obtaining high joint efficiency - Summarizes the research and application of friction stir welding to high strength 7XXX series alloys, exploring the past and current developments in the field
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 79
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Book Description
This report describes the second phase of an investigation to improve welds in high strength aluminum alloys such as 7075 and 7178. Direct current, straight polarity, helium shielded tungsten arc automatic welding was preferred for most consistent results, although highest individual weld strengths were achieved with carefully controlled consumable electrode short arc technique. High travel speeds, with TIG welding, decreased weld strength because of small hot-short cracks. Cold working of welds before aging often caused cracks and had no beneficial effect on strength. Locally heat treating welds with a low power arc before aging increased ductility in both tensile and bulge tests. Strength was about equivalent to no heated welds. Base metal properties determined after short time exposure to high temperatures were used to predict joint designs for local heat treatments.
Author: Robert Melvin Evans
Publisher:
ISBN:
Category : Aluminum alloys
Languages : en
Pages : 34
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Book Description
This memorandum describes the fusion-welding characteristics, mechanical properties, and stress-corrosion behavior of high-strength, weldable aluminum alloys. These are defined as alloys in which sound welds can be produced and in which at least 50 and 70 percent of the maximum base-metal strength can be retained in the as-welded and post-weld-treated conditions, respectively. Careful selection of joining method and filler metals as well as close control of joining-process parameters is necessary to produce high-strength aluminum weldments. Highest strengths and weld-joint efficiencies in high-strength weldable alloys are achieved with the use of postweld aging and/or mechanical treatments. The best combination of highest strengths and good welding characteristics is found in the 2000 and 7000 alloy series. As compared with the 2000 and 5000 alloy series, the 7000 alloy as a class suffer three major property disadvantages: (1) their tendency to be notch sensitive, (2) their tendency to exhibit low toughness at low temperatures, and (3) their much greater susceptibility to stress-corrosion cracking. Nonetheless, several relatively new 7000 series alloys have been developed which show reasonably good notch toughness to -423 F and which are considered competitive with the 2219 and 2014 alloys for cryogenic applications. (Author).
Author: William George Fricke
Publisher:
ISBN:
Category : Aluminum alloys
Languages : en
Pages : 108
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Author: S. Kou
Publisher:
ISBN: 9781581453195
Category : Aluminum alloys
Languages : en
Pages : 20
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Author: Bazani Shaik
Publisher:
ISBN:
Category : Electronic books
Languages : en
Pages : 0
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Book Description
Today is an era of metals including Aluminum alloys owing to a fundamental paradigm shift in research objectives. In addition to superior performance and lightweight criteria that are used to define the innovations of yore, scientists today are compelled to take into consideration the environment-friendliness of the new and novel materials being developed due to the concerns of maintaining a sustainable and safe existence. The solid-state Friction stir welding process has immense potential in the areas of automobiles, aerospace and construction industries due to its overwhelming advantages over the conventional fusion welding process of aluminum alloys. The thesis presents an experimental investigation of friction stir welding of dissimilar aluminum alloys AA7075T651 and AA6082T651. Mathematical modeling equations are developed to predict the tensile strength, impact strength, elongation, and micro-hardness of the dissimilar FSW joints AA7075T651 and AA6082T651. The process parameters are optimized for maximum tensile strength and hardness values. Post weld heat treatment is conducted and the metallurgical properties of the FS welded AA7075T651 and AA6082T651 are presented for different combinations of tool rotational speeds. Aluminum and its alloys are widely used in nonferrous alloys for many industrial applications. Aluminum exhibits a combination of an excellent mechanical strength with lightweight and thus it is steadily replacing steel in industrial applications where the strength to weight ratio plays a significant role. In conventional welding, the joining of aluminum is mainly associated with a high coefficient of thermal expansion, solidification shrinkage and dissolution of harmful gases in the molten metal during welding. The weld joints are also associated with segregation of secondary alloys and porosities which are detrimental to the joint qualities. Friction Stir Welding (FSW) and Friction Welding (FW) are the most popular emerging solid welding techniques in aircraft and shipbuilding industries. FSW is mainly used for the joining of metal plates and FW is mainly used for the joining of rods. Both techniques are suitable for high strength material having less weight. These techniques are environmentally friendly and easy to execute. Hence, the study of these techniques can contribute much to the field of green technology. This research work is dealt with the experimental and numerical investigations on FSW and FW of aluminum alloys.
Author: R. P. Meister
Publisher:
ISBN:
Category : Aluminum
Languages : en
Pages : 88
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Book Description
The purpose of this report is to summarize the present state of aluminum-welding technology. The major topics covered are: Basic metallurgy of various heat-treatable and non-heat-treatable alloy classes; welding processes used for joining aluminum with emphasis on newer processes and procedures which are considered important in defense metals industries; welding characteristics of various alloys; comparison of tensile properties, cracking tendencies, notch toughness, and stress-corrosion characteristics of various weldments; dissimilar metal welds; and causes of porosity and cracking of aluminum welds and the effect of porosity on weld strength. (Author).
Author: Nilesh Kulkarni
Publisher: Butterworth-Heinemann
ISBN: 0128026219
Category : Technology & Engineering
Languages : en
Pages : 135
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Book Description
This book will summarize research work carried out so far on dissimilar metallic material welding using friction stir welding (FSW). Joining of dissimilar alloys and materials are needed in many engineering systems and is considered quite challenging. Research in this area has shown significant benefit in terms of ease of processing, material mixing, and superior mechanical properties such as joint efficiencies. A summary of these results will be discussed along with potential guidelines for designers. - Explains solid phase process and distortion of work piece - Addresses dimensional stability and repeatability - Addresses joint strength - Covers metallurgical properties in the joint area - Covers fine microstructure - Introduces improved materials use (e.g., joining different thicknesses) - Covers decreased fuel consumption in light weight aircraft - Addresses automotive and ship applications
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 22
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Book Description
