الفهرس 
IntroductionOnly 14 pages are availabe for public view
 |  | from | 75 |  |  |
| | | from | 75 | | |
Abstract
“In recent years, friction stir welding (FSW) method has a good mechanical properties and microstructure over conventional welding methods of aluminum alloys and there is a need for increasing the strength of friction stir welded joints to withstand various loads. In this study, a new technique of FSW is used. Vertical compensation friction stir welding (VCFSW) is used to enhance the mechanical properties and microstructure of welding joint, AA6061 aluminum alloy was selected as a base metal, while AA2024 aluminum alloy is chosen as a compensation material with strips of thickness 0, 1, 1.5,2 mm. It was found that when using welding speed of 25mm/min, 2000 rpm for tool rotation and zero tilt angle, fine grain size, higher hardness and tensile strength were observed for joints of 1 mm compensation strip than other strips. Large width of compensation strips reduces the tensile strength of welding joint, increases the difficulty of joining and causes more defects in the joint. For VCFSW, decreasing the welding speed and increasing the rotational velocity help to break the compensation material into small particles, give a sound joint and increase the quality of the joint.“In recent years, friction stir welding (FSW) method has a good mechanical properties and microstructure over conventional welding methods of aluminum alloys and there is a need for increasing the strength of friction stir welded joints to withstand various loads. In this study, a new technique of FSW is used. Vertical compensation friction stir welding (VCFSW) is used to enhance the mechanical properties and microstructure of welding joint, AA6061 aluminum alloy was selected as a base metal, while AA2024 aluminum alloy is chosen as a compensation material with strips of thickness 0, 1, 1.5,2 mm. It was found that when using welding speed of 25mm/min, 2000 rpm for tool rotation and zero tilt angle, fine grain size, higher hardness and tensile strength were observed for joints of 1 mm compensation strip than other strips. Large width of compensation strips reduces the tensile strength of welding joint, increases the difficulty of joining and causes more defects in the joint. For VCFSW, decreasing the welding speed and increasing the rotational velocity help to break the compensation material into small particles, give a sound joint and increase the quality of the joint.“In recent years, friction stir welding (FSW) method has a good mechanical properties and microstructure over conventional welding methods of aluminum alloys and there is a need for increasing the strength of friction stir welded joints to withstand various loads. In this study, a new technique of FSW is used. Vertical compensation friction stir welding (VCFSW) is used to enhance the mechanical properties and microstructure of welding joint, AA6061 aluminum alloy was selected as a base metal, while AA2024 aluminum alloy is chosen as a compensation material with strips of thickness 0, 1, 1.5,2 mm. It was found that when using welding speed of 25mm/min, 2000 rpm for tool rotation and zero tilt angle, fine grain size, higher hardness and tensile strength were observed for joints of 1 mm compensation strip than other strips. Large width of compensation strips reduces the tensile strength of welding joint, increases the difficulty of joining and causes more defects in the joint. For VCFSW, decreasing the welding speed and increasing the rotational velocity help to break the compensation material into small particles, give a sound joint and increase the quality of the joint.“In recent years, friction stir welding (FSW) method has a good mechanical properties and microstructure over conventional welding methods of aluminum alloys and there is a need for increasing the strength of friction stir welded joints to withstand various loads. In this study, a new technique of FSW is used. Vertical compensation friction stir welding (VCFSW) is used to enhance the mechanical properties and microstructure of welding joint, AA6061 aluminum alloy was selected as a base metal, while AA2024 aluminum alloy is chosen as a compensation material with strips of thickness 0, 1, 1.5,2 mm. It was found that when using welding speed of 25mm/min, 2000 rpm for tool rotation and zero tilt angle, fine grain size, higher hardness and tensile strength were observed for joints of 1 mm compensation strip than other strips. Large width of compensation strips reduces the tensile strength of welding joint, increases the difficulty of joining and causes more defects in the joint. For VCFSW, decreasing the welding speed and increasing the rotational velocity help to break the compensation material into small particles, give a sound joint and increase the quality of the joint.“In recent years, friction stir welding (FSW) method has a good mechanical properties and microstructure over conventional welding methods of aluminum alloys and there is a need for increasing the strength of friction stir welded joints to withstand various loads. In this study, a new technique of FSW is used. Vertical compensation friction stir welding (VCFSW) is used to enhance the mechanical properties and microstructure of welding joint, AA6061 aluminum alloy was selected as a base metal, while AA2024 aluminum alloy is chosen as a compensation material with strips of thickness 0, 1, 1.5,2 mm. It was found that when using welding speed of 25mm/min, 2000 rpm for tool rotation and zero tilt angle, fine grain size, higher hardness and tensile strength were observed for joints of 1 mm compensation strip than other strips. Large width of compensation strips reduces the tensile strength of welding joint, increases the difficulty of joining and causes more defects in the joint. For VCFSW, decreasing the welding speed and increasing the rotational velocity help to break the compensation material into small particles, give a sound joint and increase the quality of the joint.“In recent years, friction stir welding (FSW) method has a good mechanical properties and microstructure over conventional welding methods of aluminum alloys and there is a need for increasing the strength of friction stir welded joints to withstand various loads. In this study, a new technique of FSW is used. Vertical compensation friction stir welding (VCFSW) is used to enhance the mechanical properties and microstructure of welding joint, AA6061 aluminum alloy was selected as a base metal, while AA2024 aluminum alloy is chosen as a compensation material with strips of thickness 0, 1, 1.5,2 mm. It was found that when using welding speed of 25mm/min, 2000 rpm for tool rotation and zero tilt angle, fine grain size, higher hardness and tensile strength were observed for joints of 1 mm compensation strip than other strips. Large width of compensation strips reduces the tensile strength of welding joint, increases the difficulty of joining and causes more defects in the joint. For VCFSW, decreasing the welding speed and increasing the rotational velocity help to break the compensation material into small particles, give a sound joint and increase the quality of the joint.“In recent years, friction stir welding (FSW) method has a good mechanical properties and microstructure over conventional welding methods of aluminum alloys and there is a need for increasing the strength of friction stir welded joints to withstand various loads. In this study, a new technique of FSW is used. Vertical compensation friction stir welding (VCFSW) is used to enhance the mechanical properties and microstructure of welding joint, AA6061 aluminum alloy was selected as a base metal, while AA2024 aluminum alloy is chosen as a compensation material with strips of thickness 0, 1, 1.5,2 mm. It was found that when using welding speed of 25mm/min, 2000 rpm for tool rotation and zero tilt angle, fine grain size, higher hardness and tensile strength were observed for joints of 1 mm compensation strip than other strips. Large width of compensation strips reduces the tensile strength of welding joint, increases the difficulty of joining and causes more defects in the joint. For VCFSW, decreasing the welding speed and increasing the rotational velocity help to break the compensation material into small particles, give a sound joint and increase the quality of the joint.“In recent years, friction stir welding (FSW) method has a good mechanical properties and microstructure over conventional welding methods of aluminum alloys and there is a need for increasing the strength of friction stir welded joints to withstand various loads. In this study, a new technique of FSW is used. Vertical compensation friction stir welding (VCFSW) is used to enhance the mechanical properties and microstructure of welding joint, AA6061 aluminum alloy was selected as a base metal, while AA2024 aluminum alloy is chosen as a compensation material with strips of thickness 0, 1, 1.5,2 mm. It was found that when using welding speed of 25mm/min, 2000 rpm for tool rotation and zero tilt angle, fine grain size, higher hardness and tensile strength were observed for joints of 1 mm compensation strip than other strips. Large width of compensation strips reduces the tensile strength of welding joint, increases the difficulty of joining and causes more defects in the joint. For VCFSW, decreasing the welding speed and increasing the rotational velocity help to break the compensation material into small particles, give a sound joint and increase the quality of the joint.“In recent years, friction stir welding (FSW) method has a good mechanical properties and microstructure over conventional welding methods of aluminum alloys and there is a need for increasing the strength of friction stir welded joints to withstand various loads. In this study, a new technique of FSW is used. Vertical compensation friction stir welding (VCFSW) is used to enhance the mechanical properties and microstructure of welding joint, AA6061 aluminum alloy was selected as a base metal, while AA2024 aluminum alloy is chosen as a compensation material with strips of thickness 0, 1, 1.5,2 mm. It was found that when using welding speed of 25mm/min, 2000 rpm for tool rotation and zero tilt angle, fine grain size, higher hardness and tensile strength were observed for joints of 1 mm compensation strip than other strips. Large width of compensation strips reduces the tensile strength of welding joint, increases the difficulty of joining and causes more defects in the joint. For VCFSW, decreasing the welding speed and increasing the rotational velocity help to break the compensation material into small particles, give a sound joint and increase the quality of the joint.“In recent years, friction stir welding (FSW) method has a good mechanical properties and microstructure over conventional welding methods of aluminum alloys and there is a need for increasing the strength of friction stir welded joints to withstand various loads. In this study, a new technique of FSW is used. Vertical compensation friction stir welding (VCFSW) is used to enhance the mechanical properties and microstructure of welding joint, AA6061 aluminum alloy was selected as a base metal, while AA2024 aluminum alloy is chosen as a compensation material with strips of thickness 0, 1, 1.5,2 mm. It was found that when using welding speed of 25mm/min, 2000 rpm for tool rotation and zero tilt angle, fine grain size, higher hardness and tensile strength were observed for joints of 1 mm compensation strip than other strips. Large width of compensation strips reduces the tensile strength of welding joint, increases the difficulty of joining and causes more defects in the joint. For VCFSW, decreasing the welding speed and increasing the rotational velocity help to break the compensation material into small particles, give a sound joint and increase the quality of the joint.“In recent years, friction stir welding (FSW) method has a good mechanical properties and microstructure over conventional welding methods of aluminum alloys and there is a need for increasing the strength of friction stir welded joints to withstand various loads. In this study, a new technique of FSW is used. Vertical compensation friction stir welding (VCFSW) is used to enhance the mechanical properties and microstructure of welding joint, AA6061 aluminum alloy was selected as a base metal, while AA2024 aluminum alloy is chosen as a compensation material with strips of thickness 0, 1, 1.5,2 mm. It was found that when using welding speed of 25mm/min, 2000 rpm for tool rotation and zero tilt angle, fine grain size, higher hardness and tensile strength were observed for joints of 1 mm compensation strip than other strips. Large width of compensation strips reduces the tensile strength of welding joint, increases the difficulty of joining and causes more defects in the joint. For VCFSW, decreasing the welding speed and increasing the rotational velocity help to break the compensation material into small particles, give a sound joint and increase the quality of the joint.“In recent years, friction stir welding (FSW) method has a good mechanical properties and microstructure over conventional welding methods of aluminum alloys and there is a need for increasing the strength of friction stir welded joints to withstand various loads. In this study, a new technique of FSW is used. Vertical compensation friction stir welding (VCFSW) is used to enhance the mechanical properties and microstructure of welding joint, AA6061 aluminum alloy was selected as a base metal, while AA2024 aluminum alloy is chosen as a compensation material with strips of thickness 0, 1, 1.5,2 mm. It was found that when using welding speed of 25mm/min, 2000 rpm for tool rotation and zero tilt angle, fine grain size, higher hardness and tensile strength were observed for joints of 1 mm compensation strip than other strips. Large width of compensation strips reduces the tensile strength of welding joint, increases the difficulty of joining and causes more defects in the joint. For VCFSW, decreasing the welding speed and increasing the rotational velocity help to break the compensation material into small particles, give a sound joint and increase the quality of the joint.