Fiber laser welding machines are becoming more and more popular in various fields. Because its price is getting lower and lower. And it's easy to operate. However, there are still some people who have no experience with laser machines. They may face a lot of hiccups or problems, especially with focus. Many people don’t know how to find focus.

Why find the focus of fiber laser welding machine?

Adjust the working size of the fiber laser welding machine through the lens. The F-theta lens is a convex lens, like a magnifying glass. We know it has a focal length from lens to lens. At this length, all optical power is concentrated at one point, and the power is very high. Fiber laser welding machines use this theory to focus all laser light on one point. Lasers can leave marks at high temperatures.

So, the laser welding machine can only work properly when the machine is in the correct focus. Because of this, before using the laser, we need to find the correct focus.
                       
How to find the focus of fiber laser welding machine?

There are three methods that can help us find the right focus.

First, we need to find focus manually. Place the small metal piece on the work area and select the "Continue" button. Next, we need to adjust the laser welding joint up and down and check the laser. If there is a strong laser effect on the metal surface, that is the focus. This is the most common method and easy to learn.

Measure the length. Lenses of different working sizes have special focal lengths. We can measure the length of F-θ from the lens to the workpiece. There are some problems with this method as there may be some errors in the measurements. After finding focus this way, we still need to make some fine-tuning.

Red pointer outside. We installed an additional red pointer underneath the laser welded header. When the machine is turned on, there are two things. When two points overlap, that's the correct focus. Now we install it on all machines. It can save users a lot of time.