Skip to main content

2020 | Buch

Fundamentals and Details of Laser Welding

insite
SUCHEN

Über dieses Buch

This highly illustrated book presents the essential information and major constituents of laser welding, including laser brazing and laser-arc hybrid welding. Students, engineers, researchers, scientists, specialists, professors, consultants, designers, and executives worldwide will fully grasp the fundamentals, the present state, and the applications of laser welding. Welding phenomena, formation mechanisms and preventive procedures of welding defects, and process monitoring and adaptive control are especially emphasized, because understanding these aspects of laser welding greatly improves the performance of work and research and solves many problems in the field. Finally, the book shows how increasingly widespread use of a variety of materials is bringing major advances to laser welding.

Inhaltsverzeichnis

Frontmatter
Chapter 1. Kinds and Characteristics of Lasers for Welding
Abstract
A lot of industrial lasers have been developed for actual materials processing up to now. And thus, this chapter first describes the fundamentals of lasers, principles of laser emission, and kinds and characteristics of industrial lasers for welding and joining. In particular, the emission principles and device characteristics of CO2, YAG, diode, disk, fiber, green or blue, and ultrashort pulse picosecond or femtosecond lasers are described in detail together with their respective welding or joining applications.
Seiji Katayama
Chapter 2. Fundamentals of Laser–Materials Interaction and Peripheral Optical System
Abstract
It is therefore important to understand the fundamentals of laser–materials interaction especially during welding. This chapter describes fundamentals of laser–materials interaction, for example, laser absorption, transmission and reflection of materials, the effect of polarization on the laser absorption of materials, and the effect of laser-induced plume or plasma on laser propagation, reflection, and absorption. It also refers to peripheral optical system such as focusing optics, and the measurement and monitoring of laser power density, and fiber delivery system.
Seiji Katayama
Chapter 3. Fundamentals and Features of Laser Welding
Abstract
Laser welding is one of the most advanced active materials processing, and researches and developments of laser welding are performed all over the world. This chapter refers to fundamentals and features of laser welding. In particular, important results and applications are described concerning welding, joining, or brazing of various materials with CO2, YAG, diode, disk, fiber, green, blue, or ultrashort pulse picosecond or femtosecond lasers.
Seiji Katayama
Chapter 4. Laser Welding Results and Phenomena
Abstract
Laser welding is applied in many industries and is chiefly performed in PW or CW mode. Therefore, to understand the phenomena during laser welding is said to be difficult. However, recently, high-speed cameras for the behavior observation of a plume and/or a molten pool are highly advanced. It is important to understand the respective phenomena of welding with PW and CW mode lasers. This chapter chiefly describes phenomena during spot welding with pulsed laser and during bead-on-plate (melt run) welding with CW CO2, YAG, fiber, or disk laser. The effects of laser welding conditions on the weld penetration depths and welding defects are referred. Plume behavior and physical phenomena, keyhole action, and melt flows in the molten pool and spattering during PW and CW laser welding are described in detail. It also refers to modeling and simulation of laser welding.
Seiji Katayama
Chapter 5. Formation Mechanisms and Preventive Procedures of Laser Welding Defects
Abstract
The applications of laser welding are increasing in many industries. However, welding imperfections or defects leading to fracture and disaster of manufactured goods or constructions may take place under improper welding conditions. Therefore, this chapter describes the features of various welding defects. In particular, the formation mechanisms and prevention procedures of porosity, hot (solidification) cracking, spattering leading to underfilled beads, humping, and undercutting are described in detail on the basis of interpretation of welding phenomena. The chapter also refers to hardness profiles and mechanical properties of laser-welded joints, and the importance of softening.
Seiji Katayama
Chapter 6. Characteristic Welding Processes
Abstract
Various welding processes have been developed for high-speed and/or good-quality production. Concerning important characteristic welding processes, this chapter describes welding processes, features, and welding results of tailored blank welding, remote laser welding, laser brazing, laser soldering, welding with beam-mode-modified laser, and laser–arc hybrid welding. At present, tailored blank welding is applied to almost all doors of cars. Remote welding is one of the most expected processes and is actively studied and researched. Laser brazing is mainly applied to trunk lids and sometimes to car roofs. Welding with a beam-mode-modified laser is tried to reduce spattering. Laser–arc hybrid welding is mainly used to join thick plates of steels, and aluminum alloys can be stably welded by hybrid welding.
Seiji Katayama
Chapter 7. Process Monitoring, Sensing, and/or Adaptive Control during Laser Welding
Abstract
It is important to produce high-quality laser welds under process monitoring, sensing, and/or adaptive control. Concerning pre-, in- and post-process of laser welding, this chapter describes process monitoring for detection of welding defects, sensing or seam tracking during laser welding, and optical coherence tomography (OCT) and its applications to seam tracking, bead surface profile monitoring, and keyhole depth measurement. The results obtained by using in-process monitoring and adaptive control during pulsed or CW laser welding are also introduced.
Seiji Katayama
Chapter 8. Features of Laser Welding or Joining of Various Materials
Abstract
Recently, various materials are subjected to laser welding. Thus, this chapter describes the features and characteristics of laser welding or joining of most chief important materials such as steels, stainless steels, aluminum alloys, copper, magnesium alloys, titanium, Ni-based super-alloys, ceramics, plastics, and glasses. Understanding of laser welding will be enhanced from the viewpoint of materials.
Seiji Katayama
Chapter 9. Laser Welding, Joining, or Brazing of Dissimilar Materials
Abstract
Concerning laser welding, establishment of welding, joining, or brazing of dissimilar materials is most expected from the recent tendency of the use of multi-materials. This chapter describes bonding results and features in joining a variety of dissimilar materials shown in the following combinations: steel and cast iron, steel or titanium and aluminum alloy, steel and copper, steel, stainless steel or Zn-coated steel and magnesium alloy, copper and aluminum alloy, metal to plastic or CFRP, and metal to ceramic. The basic joining principles of dissimilar materials will be understood.
Seiji Katayama
Chapter 10. Industrial Applications of Laser or Hybrid Welding
Abstract
Laser welding with CO2, YAG, diode, disk, and fiber lasers has been used for industrial applications. Laser welding, joining, brazing, and hybrid welding of various materials are used in most industries. This chapter describes a variety of application examples in steel, automobile, heavy, jewelry, glass frame, and medical industries.
Seiji Katayama
Metadaten
Titel
Fundamentals and Details of Laser Welding
verfasst von
Dr. Seiji Katayama
Copyright-Jahr
2020
Verlag
Springer Singapore
Electronic ISBN
978-981-15-7933-2
Print ISBN
978-981-15-7932-5
DOI
https://doi.org/10.1007/978-981-15-7933-2

    Marktübersichten

    Die im Laufe eines Jahres in der „adhäsion“ veröffentlichten Marktübersichten helfen Anwendern verschiedenster Branchen, sich einen gezielten Überblick über Lieferantenangebote zu verschaffen.