CO2 Laser Cutting by Dr John Powell DSc, DIC, CEng, CPhys (auth.)

By Dr John Powell DSc, DIC, CEng, CPhys (auth.)

Show description

Read or Download CO2 Laser Cutting PDF

Best nonfiction_8 books

Selected Advances in Nanoelectronic Devices: Logic, Memory and RF

Nanoelectronics, as a real successor of microelectronics, is unquestionably an immense know-how boomer within the twenty first century. This has been proven by way of its a number of purposes and in addition through its huge, immense strength to steer all components of electronics, desktops, details expertise, aerospace safety, and shopper items.

Interfaces, Quantum Wells, and Superlattices

The NATO complex research Institute on "Interfaces, Quantum Wells and Superlattices" used to be held from August sixteenth to twenty ninth, 1987, in Banff, Alberta, Canada. This quantity comprises many of the lectures that got on the Institute. many of the lectures had already been provided at an prior assembly and seem as an alternative within the complaints of the NATO complex examine Institute on "Physics and purposes of Quantum Wells and great lattices" held in Erice from April twenty first to may perhaps 1st prior within the 12 months and released by means of Plenum Press.

The Making of Statisticians

Like many different scientists, i've got lengthy been drawn to heritage. I get pleasure from analyzing in regards to the trivialities of its day-by-day unfolding: the coinage, nutrition, outfits, video games, literature and conduct which represent a humans. i'm over excited via the extensive sweep of its significant occasions: the wars, famines, migrations, reforms, political swings and clinical advances which form a society.

Economic Modelling in the OECD Countries

One of the 159 member international locations of the United countries association that are handled as state devices, whereas smaller international locations are grouped jointly in areas. The variety of equations used is nearly thirteen seven-hundred, whereas the variety of software program steps for computation is nearly a hundred thousand. Computation, together with tabulation, can however be played very quickly, and merely approximately 20 mins is needed to make forecasts from the current as much as the yr 2000.

Additional info for CO2 Laser Cutting

Sample text

2 (Sect. 1). Chapter 2 Laser Cutting Steels The laser cutting industry is dominated by the profiling of steel sheet of both mild and stainless grades. The cutting process is achieved by a combination of laser heating and the chemical reaction of iron with oxygen. This oxidation reaction is exothermic (heat generating) and acts as a secondary energy source which helps to accelerate the cutting process. Basically, the steel is locally heated by the focused laser beam to a temperature at which the iron will ignite in the oxygen jet acting coaxially with the beam.

Generally it is wisest to find the nominal focal point (by methods explained in Sect. 3) and position this on the surface of the workpiece. In some cases, when cutting thicker section steels, improved results can be obtained by positioning the focal point two or three millimetres below the material surface. These comments are all relevant to a machine which is working correctly within the usual range of focused spot sizes. This spot size can be enlarged as a result of a number of faults in the system.

In the absence of a thick surface oxide layer this process is very rapid. However, when hot rolled steel is to be penetrated in this way, the surface oxide serves to protect the underlying steel. A larger interaction time is needed for the heat and oxygen to penetrate this oxide barrier. This increase in initiation time means that melting is more widespread. The blast holes tend to be larger and heating of the area around the hole increased. For these reasons it can be more difficult to produce detailed work in black, hot rolled steel, particularly when working with only moderate (-400 W) laser powers.

Download PDF sample

Rated 4.56 of 5 – based on 9 votes