Overview of friction stir welding and examples of adoptions highlights and issues- Fundamentals of the friction stir process process parameters, material flow and microstructural evolution, tool features and role- Modeling and simulation of microstructural evolution during FSW/P- Friction stir welding configurations and tool selection gaps and mismatches- FSW of aluminum alloys low strength alloys, tailor welded blanks and tool/process design to maximize productivity, high strength alloys and strategies to maximize joint efficiency- FSW of magnesium alloys- FSW of high temperature alloys issues with tool materials and examples of titanium alloys and steels- Friction stir processing overview of derivative processes and potential- Residual stresses and mitigation strategies

Friction Stir Welding and Processing : Science and Engineering

Friction stir welding (FSW) has received a great deal of attention as a new solid-state welding technique. In the present study, the relationship between the microstructure of stir zone and the mechanical property of FS-welded 5083 aluminum alloy was investigated. The microstructures of the stir zones consisted of fine equiaxed grains at various FSW conditions in FS-welded 5083 Al alloy. However, the grain size of the stir zone decreased with the decrease in friction heat flow during FSW. The ductility in FS-welded 5083 Al alloy increased with the decrease in friction heat flow. It was indicated that the formability in FS-welded 5083 Al alloy was improved by the refinement of grain size of the stir zone.

Influence of friction stir welding parameters on grain size and formability in 5083 aluminum alloy

Gas tungsten-arc filler welding of AZ31 magnesium alloy

Effect of pin tool thread orientation on fatigue strength of friction stir welded AZ31B-H24 Mg butt joints

Effects of microstructural inhomogeneities and micro-defects on tensile and very high cycle fatigue behaviors of the friction stir welded ZK60 magnesium alloy joint

Magnesium alloys have attracted special attention of researchers working in transportation industries because they are the best lightweight structural materials with a relatively high-strength to weight ratio and excellent technological properties. Enhancement of structural application of such a structural material depends on the ability of construction by welding. The welding of magnesium alloys has been investigated widely. Results indicate that FSW (friction stir welding) and TIG (tungsten inert gas arc welding) are successful welding methods for magnesium alloys and aluminum alloys. 1–4) Reliability is their salient attribute, especially for use in the transportation industry. Therefore, the clarification of fatigue properties must precede application of joining by welding. 5) This study investigated the factors which affect the fatigue strength of the welded commercial magnesium alloy joints as welded surface. Investigated alloys were extruded or rolled AZ31 and AZ61. The welding processes used in this investigation were TIG and FSW. Joint efficiencies (%)

Fatigue of Welded Magnesium Alloy Joints

PURPOSE: To improve abrasion resistance by a method wherein a cutter ring is mounted on a roller cutter of a cutter head so as to be formed into an annular shape having approximately an angular section and the cutter ring is integrally molded using specific cemented carbide CONSTITUTION: A cutter ring 1 which is mounted on a roller cutter 3 and formed into an annular shape having approximately an angular section is integrally molded using a cemented carbide comprising WC of 80-90wt% and CO of 10-20wt% Next, the cutter ring 1 is rapidly heated by induction heating and mounted on the roller cutter 3 by shrink fit And in order to mount the ring 1 by shrink fit, heating temperature is preferably set at a temperature which can be easily provided at a site and at which oxidation of cemented carbide is not effected, and a shrink fit allowance is ensured according to such conditions And in order to obtain flexibility which can bear a impact at the time of excavation, WC of 90wt% or less is provided to achieve a predetermined coefficient of linear expansion and value of impact energy, and to enhance abrasion resistance, wt% of WC is made 80 or more to provide sufficient hardness

Cutter ring of tunnel excavator and method for mounting the same

PROBLEM TO BE SOLVED: To provide a low floor type vehicle allowing a person to get in and out the vehicle easily and allowing a wheel chair and a baby carriage to move smoothly in the vehicle by widening an area and a width of a low floor face of a compartment as much as possible. SOLUTION: A moving carrier 2 including driving wheels 7 connected with a motor 7a is arranged on a vehicle end side further more than an entrance 5b close to a vehicle end of the compartment, the moving carrier 2 is provided at the vehicle end, and a driver's cab is arranged in its upper part. Moreover, the motor for driving the driving wheels 7 are provided in an upper part of a vehicle body. The vehicle body consists of a vehicle body having no moving carrier and another vehicle body provided with the moving carrier.

Low floor type vehicle and vehicle body for driver's cab

In order to improve the fuel efficiency and the operating performance of motorcycles, there is a need to reduce their weight. Magnesium, which is the lightest of the various metals currently being used and has a high specific strength, has the potential to satisfy that need. We conducted a study to clarify the weldability and strength characteristics of, and the most suitable surface treatment for, extruded magnesium alloys and rolled magnesium alloys. Based on the stress analysis by the finite element method, we designed a magnesium swing arm and produced the prototype swing arm by pressing hot rolled AZ31 magnesium alloy plates and welding them. The prototype is about 10% lighter and has higher torsional rigidity than a conventional aluminum swing arm.

Development of a Magnesium Swing Arm for Motorcycles

A swingarm assembly ( 12 ) for use in motorcycles for supporting a motorcycle rear wheel ( 13 ) includes left and right arms ( 23 L, 23 R) and a connecting member ( 24 ) by which the left and right arms ( 23 L, 23 R) are connected together At least the arms ( 23 L, 23 R) are products of magnesium alloy that are formed by an extrusion technique or a drawing technique

Akiyoshi Mizuta

Papers

Fatigue of Welded Magnesium Alloy Joints

Cutter ring of tunnel excavator and method for mounting the same

Low floor type vehicle and vehicle body for driver's cab

Development of a Magnesium Swing Arm for Motorcycles

Motorcycle swingarm assembly