Plastic and their joining processes for different industrial uses
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There are two major classifications of polymers: thermoplastics and thermosetting plastics. Thermoplastics can be remelted and reshaped upon heating, while thermosetting plastics set permanently and cannot be remelted upon heating. Plastics are widely used in cars, pipes, flooring, kitchen countertops, and tires due to their corrosion resistance, ability to be formed into complex shapes, variety of appearances and colors, and insulation properties. However, plastics also have disadvantages such as low strength, limited temperature range, potential brittleness over time, and sensitivity to the environment. Common joining methods for plastics include mechanical fasteners, adhesives, welding processes like ultrasonic welding
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This document discusses various unconventional metal forming processes including high energy rate forming processes like explosive forming, magnetic forming, and electro hydraulic forming. It explains that these processes use large amounts of energy applied very quickly to deform metals. Some advantages are low die costs, easy maintenance of tolerances, and the ability to form difficult metals. The document also covers powder metallurgy and describes the production and applications of parts formed by this process.
Ultrasonic weld test
Welding Fundamental
Ultrasonic Welding
Ultrasonic Testing
index::
Introduction
Welding Fundamental
Welding Definition
Weld Type
Weld Shapes
Weld Applications
Weld Defects
Welding Inspection
Ultrasonic Welding
Ultrasonic Testing
DFM (design for manufacturing) example bluestar mould - automotive mold ma...
Bluestar Mould is located in Shenzhen, China and has more than 20 year experience in mold making and plastic part production.
Website: http://bluestar-mould.com
Introduction to welding and joining
This document discusses joining processes and focuses on welding. It introduces different types of joining processes and classifies them. Welding is described as a process that joins materials by melting and sometimes adding a filler material to form a joint. There are different types of weld joints and welds as well as welding processes. Key welding processes mentioned include oxy fuel gas welding, arc welding, resistance welding, and laser beam welding. The document provides classifications of joining processes and welding processes.
Welding and allied processes
welding, types arc welding, gas welding, fabrication, joinning process, forge welding, solid state welding, explosion welding, friction welding, tig welding, mig welding
DFM Design Principles
The document discusses key principles of design for manufacturing (DFM) including minimizing part count, using standard components and materials, designing for tolerances, collaborating with manufacturing, and understanding production processes and costs. It emphasizes reducing costs at each stage of production from components to assembly to overhead. Designs should be optimized through an iterative process of cost analysis and redesign while considering production volumes and other factors.
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This document discusses different types of plastics used in construction, their properties, and applications. It outlines several families of plastics like acrylic, composites, expanded polystyrene, polycarbonate, polyethylene, polypropylene, and polyvinyl chloride. Plastics are described as strong, lightweight materials that are durable, weather resistant, and don't corrode. The document also examines various polymers used in construction and their applications, including flooring, windows, pipes, seals, and insulation. It provides examples of specific plastics like epoxy, polyethylene, polycarbonate, and their construction uses.
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1:该专业认证可证明留学生真实身份
2:同时对留学生所学专业登记给予评定
3:国家专业人才认证中心颁发入库证书
4:这个认证书并且可以归档倒地方
5:凡事获得留信网入网的信息将会逐步更新到个人身份内，将在公安局网内查询个人身份证信息后，同步读取人才网入库信息
6:个人职称评审加20分
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留信网认证的作用:
1:该专业认证可证明留学生真实身份
2:同时对留学生所学专业登记给予评定
3:国家专业人才认证中心颁发入库证书
4:这个认证书并且可以归档倒地方
5:凡事获得留信网入网的信息将会逐步更新到个人身份内，将在公安局网内查询个人身份证信息后，同步读取人才网入库信息
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7:个人信誉贷款加10分
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Findings: Based on findings, the Gumbel approach produced the highest intensity values, whereas the other approaches produced values that were close to each other. The data indicates that 461.9 mm of rain fell during the monsoon season’s 301st week. However, it was found that the 29th week had the greatest average rainfall, 92.6 mm. With 952.6 mm on average, the monsoon season saw the highest rainfall. Calculations revealed that the yearly rainfall averaged 1171.1 mm. Using Weibull’s method, the study was subsequently expanded to examine rainfall distribution at different recurrence intervals of 2, 5, 10, and 25 years. Rainfall and recurrence interval mathematical correlations were also developed. Further regression analysis revealed that short wave irrigation, wind direction, wind speed, pressure, relative humidity, and temperature all had a substantial influence on rainfall.
Originality and value: The results of the rainfall IDF curves can provide useful information to policymakers in making appropriate decisions in managing and minimizing floods in the study area.
Null Bangalore | Pentesters Approach to AWS IAM
#Abstract:
- Learn more about the real-world methods for auditing AWS IAM (Identity and Access Management) as a pentester. So let us proceed with a brief discussion of IAM as well as some typical misconfigurations and their potential exploits in order to reinforce the understanding of IAM security best practices.
- Gain actionable insights into AWS IAM policies and roles, using hands on approach.
#Prerequisites:
- Basic understanding of AWS services and architecture
- Familiarity with cloud security concepts
- Experience using the AWS Management Console or AWS CLI.
- For hands on lab create account on [killercoda.com](https://killercoda.com/cloudsecurity-scenario/)
# Scenario Covered:
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- Implementing IAM Policies with Least Privilege to Manage S3 Bucket
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- Attach least privilege policy to IAM user.
- Validate access.
- Exploiting IAM PassRole Misconfiguration
-Allows a user to pass a specific IAM role to an AWS service (ec2), typically used for service access delegation. Then exploit PassRole Misconfiguration granting unauthorized access to sensitive resources.
- Objective: Demonstrate how a PassRole misconfiguration can grant unauthorized access.
- Steps:
- Allow user to pass IAM role to EC2.
- Exploit misconfiguration for unauthorized access.
- Access sensitive resources.
- Exploiting IAM AssumeRole Misconfiguration with Overly Permissive Role
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- Objective: Show how overly permissive IAM roles can lead to privilege escalation.
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- Create role with administrative privileges.
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- Perform administrative actions.
- Differentiation between PassRole vs AssumeRole
Try at [killercoda.com](https://killercoda.com/cloudsecurity-scenario/)
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原件一模一样【微信：bwp0011】《(Humboldt毕业证书)柏林大学毕业证学位证》【微信：bwp0011】学位证，留信认证（真实可查，永久存档）原件一模一样纸张工艺/offer、雅思、外壳等材料/诚信可靠,可直接看成品样本，帮您解决无法毕业带来的各种难题！外壳，原版制作，诚信可靠，可直接看成品样本。行业标杆！精益求精，诚心合作，真诚制作！多年品质 ,按需精细制作，24小时接单,全套进口原装设备。十五年致力于帮助留学生解决难题，包您满意。
本公司拥有海外各大学样板无数，能完美还原。
1:1完美还原海外各大学毕业材料上的工艺：水印，阴影底纹，钢印LOGO烫金烫银，LOGO烫金烫银复合重叠。文字图案浮雕、激光镭射、紫外荧光、温感、复印防伪等防伪工艺。材料咨询办理、认证咨询办理请加学历顾问微bwp0011
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三.真实教育部学历学位认证（教育部存档！教育部留服网站永久可查）
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◇在校期间，因各种原因未能顺利毕业……拿不到官方毕业证【微bwp0011】
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1:该专业认证可证明留学生真实身份
2:同时对留学生所学专业登记给予评定
3:国家专业人才认证中心颁发入库证书
4:这个认证书并且可以归档倒地方
5:凡事获得留信网入网的信息将会逐步更新到个人身份内，将在公安局网内查询个人身份证信息后，同步读取人才网入库信息
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7:个人信誉贷款加10分
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Plastic and their joining processes for different industrial uses
- 2. Classification of polymers Thermoplastics •Above the melting point, the secondary bonds weaken, making it easier to form the plastic into any desired shape •On cooling, it returns to its original strength and hardness •reversible process. Thermosetting Plastics (thermosets) •Permanent shape •Cannot be re-melted •continued heating leads to degradation or decomposition •better mechanical, thermal and chemical properties •better electrical resistance and dimensional stability than do thermoplastics. There are two major classifications of polymers
- 3. Uses of Plastics The modern car is made of many different type of plastics, ranging from shock absorbing bumper bars to durable tyres and internal fittings. Some plastics do not react with other substances and are chemically inert and non-toxic. Many pipes are now made out of a plastic called polyvinyl chloride (PVC). In kitchen a granite bench top is actually made of hard, durable plastic, while the tiles on the floor are made of vinyl plastic. Some plastics (elastomers)are very flexible and resist melting,are used in making tyres.
- 4. Why Design with Plastics? Corrosion resistance Low electrical and thermal conductivity, insulator Easily formed into complex shapes, can be formed, casted and joined. Wide choice of appearance, colors and transparencies Disadvantages of using Plastics Low strength Low useful temperature range (up to 600 o F) Less dimensional stability over period of time (creep effect) Aging effect, hardens and become brittle over time Sensitive to environment, moisture and chemicals Poor machinability
- 5. Joining Methods of Plastics Mechanical Fasteners Adhesives Welding Processes • can join two components quickly do not provide leak • tight joint • good properties and fully sound joints • difficult to handle and slow to • cure • to produce bonded joints • confined to thermoplastic polymers
- 6. Ultrasonic Welding Internal friction induced by ultrasonic oscillation melts the boundary surfaces of the joining partners. Fusion of the parts is reached by applying a certain pressure Advantages • Very short cycle times • Limited 3D contours – joints do not have to be completely flat • Low maintenance costs Disadvantages • Flash generated • limited to small components • Particulate development – dust-like particles left behind that may cause part contamination expensive
- 7. Applications of Ultrasonic Welding Computer and electrical industries Aerospace and automotive industries Medical industry Packaging industry
- 8. Friction Welding Parts are rubbed together, the friction created from this process generates heat at the contacting surfaces where the plastic becomes molten and weldable Advantages • inexpensive process • Low maintenance • Low cycle times Disadvantages • large flash generated • High mechanical load • Limited design freedom • Large weld line width
- 9. Applications of Friction Welding domestic appliance industry Automobile industry
- 10. Vibration Welding the vibrations applied typically of 100 – 240 Hz, 1-5 mm amplitude parts are rubbed together due to machine vibration Advantages ability to weld a number of components simultaneously Ability to join large no. of pieces Disadvantages For very small and light parts
- 11. Applications of Vibration Welding Automobile industry domestic appliance industry