Tech

Why is the world shifting towards laser welding?

Laser welding has a lot of advantages over traditional welding, such as being faster and easier. Many of these benefits come from the ability to make a “keyhole” with laser welding. To heat the material from both the top and the bottom, you can use these hole (s). List of the main reasons why this is a good thing:

The ability to react quickly and change quickly

Putting metal together with lasers is a quick way to do it. Lasers can be used to weld thin materials at speeds of many meters per minute, depending on the type and power of the laser. Lasers can be used in very automated places and have a lot of people working at the same time. The laser keyhole welding technology may be able to finish a joint in one pass. In contrast, other methods would require several passes for thicker parts, which would lead to more productivity. A laser beam is used to fuse two metals or thermoplastics. Due to the laser’s concentrated heat source can weld thin materials at fast speeds and thick materials at narrow, deep welds between square-edged pieces.

A keyhole mechanism is employed for laser welding to attain higher power densities. A laser beam with a power density of 106-107 W/cm2 melts and vaporizes material in its path before conduction can dissipate enough heat. The laser beam is focused on a small spot. The laser beam is focused on the workpiece to create a hollow filled with metal vapor (which in some cases can even be ionized, forming plasma).

This expanding vapor or plasma helps keep the molten keyhole walls from falling into the cavity.

This keyhole increases laser beam coupling into the workpiece. To achieve deep penetration welding, the keyhole is moved along the joint, or the joint is moved relative to the laser beam—welds with a high depth to width ratio result.

Welds are formed when hot, flowing materials return into the keyhole, then cool and solidify. The weld top now has a chevron pattern heading back towards the weld’s start.

Welds that are close together

Laser welding makes it possible to make welds with a more extensive surface area (considerable depth to narrow width). Laser welding can be used to weld joint configurations that aren’t possible with other welding methods, like welding through lap joints. As a result, smaller flanges can be used instead of larger ones for resistance spot welding, which needs bigger ones. The laser welding machine price has been on the rise for the last 2 years or so.

Little heat output and low distortion are what you get with this.

Keyholes can be made with the heat from a laser. This means that samples welded with lasers don’t bend as much as samples welded with other methods. Laser welding produces a minimal amount of weld metal and only sends minimal heat into the surrounding material. The heat-affected zones on both sides of the weld are also smaller because of the low heat input. This means minor damage to the parent material and less loss of its properties.

Vacuum-formed shows

JNCT Laser welding doesn’t need to be done under high pressure like most electron beam keyhole procedures. However, gas shielding is often needed to prevent the welds from oxidizing.

A single-sided, non-contact method:

Because of this, the workpieces that are being joined don’t have to deal with any stress during the laser welding process, and the process is usually done on one side. It may be necessary to shield the weld root from the opposite side, as with many other types of fusion.

Welding that doesn’t go on for a set amount of time

Lasers can be used to make spot or stitch welds as easy as continuous welds if they are the right tool for the job.

Versatility

Lasers can be used for more than welding, like cutting, surface treatment, heat treatment, and even marking. A laser source can even be used for quick prototyping with a few minor changes. It’s also possible to think about the beam delivery method in a lot of different ways, like the following:

Multiple welding stations can use the same laser beam simultaneously, which means the laser source can do more work at the same time.

Lasers can be used to process two separate parts of a workpiece simultaneously or the same area from two different sides.

In this way, beams with different energy distributions can be processed simultaneously with the particular transmission or focusing optics.

Related Articles

Back to top button