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Monthly Archives: June 2017

Laser Cutting and Welding

Laser cutting and welding, like the names imply, use lasers to get the job done. Laser optics and computerized controls direct laser beams to the material being worked on. Depending on the material and the parameters that are set, the beam can melt, burn, cut, or vaporize the material leaving a very high-quality edge finish.

Industrial laser cutting and welding can be used on a wide variety of materials including: alloys, aluminum, brass, carbon steel, copper, nickel, stainless steel, titanium, tungsten, and platinum among others. The process is best suited for flat-sheet materials, structural pieces, and piping. Its’ closest competitors are plasma cutting and water jet cutting. Lasers can also be used to weld metals and metal alloys as an alternative to TIG welding.

Types Of Laser Cutting

Laser cutting offers many different methods, making it one of the most versatile of cutting techniques. Laser cutting methods include:

  • This method sees a focused beam heat the surface of the material to the boiling point to create a keyhole. The keyhole makes it easier to create a bigger hole, very quickly. As the hole gets deeper, the material boils and vapor erodes the walls to make the hold bigger. Vaporization is best used materials that don’t melt, like wood, carbon, and certain plastics.
  • Melt And Blow/Fusion. This method of laser cutting uses high-pressure gas to blow molten material from the cutting area. The material is first heated to the melting point, and then blown out of the kerf with a jet of gas. This method eliminates the need to raise the temperature of the material any further and has decreased power requirements. Best for metals.
  • Thermal Stress Cracking. Here, the laser beam caused localized heating and thermal expansion resulting in a crack that can then be guided by moving the beam. Good for brittle materials like glass.
  • Reactive Cutting. Also called flame cutting, this process is similar to Oxy Fuel cutting, but instead of oxygen and a fuel gas as the ignition source, the laser beam is the source. It is very effective on thick steel plates.

Advantages And Disadvantages Of Laser Cutting And Welding

Laser cutting and welding provide reduced contamination of the piece or materials and better precision than other cutting and welding methods. Lasers tend to use less energy than other methods and create little to no material warping due to having small heat affected zones.

Additional Advantages Include:

  • Good option for intricate parts cutting.
  • Narrow kerf widths.
  • Very high degree of accuracy; good for repeat processes and consistent, reliable welds.
  • Fast cutting rates.
  • Close nesting means less material waste.
  • Low rate of distortion.
  • Little to no joint preparation is necessary.
  • Little to no finishing required post-weld.
  • No filler material needed to join dissimilar metals.

Disadvantages Of Laser Cutting And Welding Are Few, But Include:

  • Cannot cut through extremely thick metals as well as plasma cutters.
  • Can be more expensive than other processes.
  • Production rates depend on the material.
  • Careful calibration is necessary to avoid burning the materials being worked on.
  • May be difficult to cut reflective materials.

Learn More About Laser Cutting At Josef Gas

Are you expanding into laser cutting? Do you need additional safety supplies to protect yourself from heat or rays? Visit Josef Gas online or in person at 201 Basaltic Road in Concord, Ontario to learn more about laser cutting. We carry machines, supplies, safety gear, and more to keep your shop running smoothly!

 

Oxy Fuel Welding

Oxy Fuel Welding (OFW) is short for oxyacetylene welding. The process uses a fuel gas, usually acetylene, and oxygen to weld and cut metals. It’s one of the oldest of welding methods, though it has declined in use with the rise of arc welding.

Today, we see Oxy Fuel welding and cutting most often used by artisans and metal workers, small, independent shops, and in situations where it is difficult to access the electricity needed to run other types of welding machines.

How Oxy Fuel Welding Works

Oxy Fuel welding is a very traditional type of welding, relying on a torch to weld the metals. There is no need for filler material or pressure to create the weld. Using fuel gas and oxygen, the torch heats the metal pieces to the point that they become molten and join together upon cooling. Flame temperatures can reach 3,200 degrees Celsius. Lower temperatures can be achieved by using propane, hydrogen, and coal gas instead of acetylene.

Oxy Fuel welding is a wide-ranging definition; it includes any type of welding operation that uses fuel gas and oxygen to create the heat needed for the weld. The oxygen is burned off as metal oxide slag. The two gases are mixed in the right proportions in a mixing chamber, which is usually found as part of the welding tip assembly. The chemical action of the flame can be adjusted by making ration adjustments in the mixing chamber. If the torch does not mix fuel with oxygen, it is not considered an Oxy Fuel application.

Advantages And Limitations Of Oxy Fuel Welding

As One Of The Simplest Forms Of Welding, Oxy-Fuel Welding Offers Many Advantages:

  • Simple and straightforward operation.
  • 3 distinct flame settings are possible: neutral, oxidizing and carburizing.
  • Produces enough heat to weld steel.
  • Portable, easy to operate equipment.
  • Produces less intense flames and UV rays than other methods.
  • High degree of operator control over heat input, weld zone temperature, and weld bead size and shape.
  • Excellent for repair welds, thin sheets, tubes, and small pipe diameters.

The Limitations Of Oxy-Fuel Welding Include:

  • Quality is dependent on operator skill, equipment, and plate conditions.
  • Not ideal for stainless steels or aluminum. Better suited for alloys and mild steels.
  • May require more finishing, depending on operator skill and intended use of finished piece.
  • Large heat affected zones (HAZ).

Purchase Fuel Gas, Oxygen, And Welding Supplies At Josef Gas

Visit Josef Gas online or in person at 201 Basaltic Road in Concord, Ontario to purchase fuel gases, oxygen, and oxy-fuel welding supplies and equipment.

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