Hot Metal Cutting Processes

SKU: C-573Duration: 28 Minutes

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Language:  English

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Welding Series (Details)
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Course Details

Specs

Training Time: 28 minutes

Compatibility: Desktop, Tablet, Phone

Based on: Industry Standards and Best Practices

Languages: English

Hot metal welding and cutting has been around for a long time, however, up until recently the applications were limited because generally the parts requiring welding had to be heated in a stationary fire or furnace. This course will briefly cover four of the major heat-based techniques for cutting or removing metal. This will include the principles and equipment used oxyacetylene cutting, air carbon arc cutting, plasma cutting, and laser cutting.

Learning Objectives

At the end of this module, you will be able to:

  • Describe the principles of oxyacetylene cutting
  • Identify the equipment used for oxyacetylene cutting
  • Describe the principles of air carbon arc cutting
  • Identify the equipment used for air carbon arc cutting
  • Describe the principles of plasma cutting
  • Describe the torch used for plasma cutting
  • Describe a cutting laser
  • Identify different types of laser cutting
  • Describe major safety hazards associated with hot metal cutting

Key Questions

The following key questions are answered in this module:

What is welding?
Welding is the process of joining like pieces of metal together with the application of heat.

What is oxyacetylene cutting?
Oxyacetylene cutting, also know as gas cutting, is a process which relies on the combustion of oxygen and acetylene to produce a very hot flame. When these gases are mixed in the correct proportion, a flame is produced with a temperature which is sufficient to melt steel.

What is air carbon arc cutting?
Air carbon arc cutting is a process similar to stick arc welding. In the cutting process, a high temperature is produced by an electric arc near the surface of a piece of metal, causing it to melt. The molten metal is removed by a jet of high velocity air.

What is plasma cutting?
Plasma cutting is an electrical process in which a flow of pressurized gas is heated and ionized as it passes through an electric arc.

What are the three main types of laser cutting?
The three major types of laser cutting are fusion cutting, reactive cutting, and remote, or vaporization cutting.

Sample Video Transcript

Below is a transcript of the video sample provided for this module:

All plasma cutting torches have an electrode centered within a nozzle. Cutting gas flows, usually with a swirling pattern, around the electrode and out through a small hole in the nozzle. To start the torch, the nozzle is initially electrically connected to the opposite (+) terminal of the power supply and a high frequency signal is applied to the electrode. This creates a small arc between the electrode and the nozzle. The arc ionizes some of the gas, making it electrically conductive and creating a plasma. The flow of gas forces the ionized gas and the arc through the nozzle orifice. At the same time, the control system makes the nozzle electrically neutral, so that if the torch is close to the workpiece the arc moves from the nozzle and is electrically attracted to the workpiece. The high temperature of the plasma melts through the metal and the exiting high velocity gas blows the molten material away.

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