INVESTIGATION TOWARD OBTAINING SIGNIFICANTLY HIGHER MECHANICAL PROPERTIES OF AS-WELDED JOINTS IN HIGH-STRENGTH, HEAT TREATABLE ALUMINUM ALLOYS. PDF Download
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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:
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:
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ISBN:
Category : Industrial arts
Languages : en
Pages : 1118
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Author:
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ISBN:
Category : Aeronautics
Languages : en
Pages : 1162
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Author: American Welding Society
Publisher:
ISBN:
Category : Aluminum
Languages : en
Pages : 142
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Author:
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ISBN:
Category :
Languages : en
Pages : 390
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Book Description
Author:
Publisher:
ISBN:
Category : Nuclear energy
Languages : en
Pages : 1118
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Book Description
Author: T. P. Groeneveld
Publisher:
ISBN:
Category : Steel, High strength
Languages : en
Pages : 22
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This memorandum briefly discusses the physical metallurgy, heat treatment, mechanical properties, stress-corrosion properties, and fabrication of the 9Ni-4Co-XC steels. This family of steels was developed specifically to meet the requirements of the aircraft and aerospace industries for materials possessing high strength and high toughness. By varying the composition and heat treatment, the 9Ni-4Co-xC steels can develop strengths in the 200 to 300 ksi tensile-strength range and reportedly possess high toughness. The lower carbon grades have excellent weldability, developing strength in the 180 to 200 ksi range with high toughness without the need for preheat or postweld-heat treatment. (Author).
Author: Jasveer Singh
Publisher: BookRix
ISBN: 3743849658
Category : Technology & Engineering
Languages : en
Pages : 64
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Book Description
Aluminium is the third most abundant element (after oxygen and silicon), and the most abundant metal in the Earth's crust. Aluminium is remarkable for the metal's low density and for its ability to resist corrosion due to the phenomenon of passivation. Structural components made from aluminium and its alloys are vital to the aerospace industry and are important in other areas of transportation and structural materials Welding plays a crucial role or say as a back bone of manufacturing industry to join the components. Friction stir welding (FSW) is a relatively new joining process that has been demonstrated in a variety of metals such as steel, titanium, lead, copper and aluminium. The unique properties of friction stir welds make possible some completely new structural designs with significant impact to ship design and construction. Friction stir welding is especially advantageous for joining aluminium and has been exploited commercially around the world in several industries. In the present work the effects of welding speed have been investigated on the microstructural and mechanical properties of friction stir welded aluminium alloy 6063. FSW was carried out at rotational speed of 1300 rpm (constant) and transverse speeds of 35, 50 and 65 mm/min. Mechanical performance has been investigated in terms of hardness, wear resistance and tensile strength. To study the effect of post welding heat treatment on properties of friction stir welded joint, the artificial ageing was carried out at 1600 C for a soaking period of 20 hours in the muffle furnace. The study revealed that friction stir welded joint prepared at welding speed of 35 mm/min exhibited better tensile strength, hardness and wear resistance. Better mechanical properties of the joint prepared at welding speed of 35 mm/min may be attributed due to fine, homogeneous and equaxed grain structure of stir zone. Post welding heat treatment of friction stir welded joint improved the wear resistance and microhardness of the joint. However tensile properties deteriorated with the post welding heat treatment of joint.
Author: Defense Documentation Center (U.S.)
Publisher:
ISBN:
Category : Technology
Languages : en
Pages : 1766
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Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 174
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