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Related Concept Videos

Structural Joints: Fibrous Joints01:03

Structural Joints: Fibrous Joints

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Fibrous joints are a type of joint where the bones are connected by fibrous connective tissue. These joints provide stability and minimal to no movement between the articulating bones. There are three types of fibrous joints.
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All the bones of the skull, except for the mandible, are joined to each other by a fibrous joint called a suture. The fibrous connective tissue found at a suture strongly unites the adjacent skull bones and thus helps to protect the brain and form the face. In...
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The mechanical characteristics of steel are assessed through various tests that evaluate its strength, toughness, and flexibility. These tests include tension, torsion, impact, bending, and hardness assessments, each providing crucial information about steel's suitability for specific applications.
The tension test is fundamental for determining tensile strength. In this test, a steel specimen is stretched using a gripping device until it breaks. The data collected during this test are used...
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Structural Joints: Cartilaginous Joints01:17

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As the name indicates, at a cartilaginous joint, the adjacent bones are united by cartilage, a tough but flexible type of connective tissue. Unlike synovial joints, these types of joints lack a joint cavity and involve bones joined together by either hyaline cartilage or fibrocartilage.
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Types of Building Separation Joints01:23

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Building separation joints divide large or complex building structures into smaller, discrete units that can move independently. These joints are categorized into three types: volume-change joints, settlement joints, and seismic separation joints.
Volume-change joints address the effects of expansion and contraction due to temperature and moisture variations. They are strategically placed at discontinuities in a building's mass where cracking is most likely and are spaced about 150 to 200...
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Method of Joints01:30

Method of Joints

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The method of joints is a commonly used technique to analyze the forces in structural trusses. The method is based on the principle of equilibrium, which assumes that the truss members are connected by frictionless pins. The forces at each joint can be determined by considering the equilibrium of the forces acting on that joint.
Since plane truss members are in the same plane, each joint is subjected to a coplanar and concurrent force system. To apply the method of joints, the first step is to...
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Generating Lap Joints Via Friction Stir Spot Welding on DP780 Steel
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Technology and Properties of Peripheral Laser-Welded Micro-Joints.

Szymon Tofil1, Hubert Danielewski1, Grzegorz Witkowski1

  • 1Laser Research Centre, Faculty of Mechatronics and Mechanical Engineering, Kielce University of Technology, Al. Tysiąclecia Państwa Polskiego 7, 25-314 Kielce, Poland.

Materials (Basel, Switzerland)
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Summary

This study details laser welding parameters for strong AISI 316L steel micro-couplings used in medical devices. Optimal settings ensure high joint strength and uniform element distribution for reliable performance.

Keywords:
butt weldcryosurgical probelaser micro-weldingthin tube welding

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Manufacturing Technology

Background:

  • Micro-couplings are critical components in medical equipment.
  • Laser welding offers precision for joining small, thin-walled metallic parts.
  • AISI 316L steel is a common material in medical devices due to its biocompatibility and corrosion resistance.

Purpose of the Study:

  • To determine optimal parameters for laser welding of thin-walled AISI 316L steel micro-couplings.
  • To characterize the properties of laser-welded joints.
  • To establish the range of effective welding parameters for micro-joining applications.

Main Methods:

  • Laser welding using a SISMA LM-D210 Nd:YAG laser.
  • Macroscopic and microscopic analysis of welded samples.
  • Assessment of elemental distribution, microhardness, and tear strength.
  • Testing of thin-walled AISI 316L steel pipes (1.5 and 2 mm diameter).

Main Results:

  • Recommended welding parameters: 2.05 J pulse energy, 4 ms pulse duration, 2 Hz frequency, 0.4 mm beam focus diameter, 0.157 rad/s rotation speed.
  • Achieved joint strength exceeding 75% of the thinner pipe's strength.
  • Observed uniform distribution of alloying elements within the weld.
  • Identified a complex dendritic structure typical of pulse laser welding.

Conclusions:

  • The established laser welding parameters provide high-quality micro-couplings.
  • The developed technology ensures reliable joints with excellent mechanical and material properties for medical applications.
  • The research provides a foundation for optimizing laser welding processes for similar micro-joining tasks.