RECOMMENDED

Laser Welding Machine

Handheld Laser Welding Machine

Handheld Laser Welding Machine

It has the advantages of simple structure, fast operation, flexible welding and strong welding penetration, and can be competent for welding at various complex angles

Automatic Laser Welding Machine

Automatic Laser Welding Machine

It has high working efficiency, faster speed than general laser welding machine, with good welding effect and stable performance

Robotic Laser Welding Machine

Robotic Laser Welding Machine

The combination of industrial robot and welding laser for three-dimensional laser welding greatly meets the market demand.

Still not finding your required machine?

Contact Our Experts For A Professional & Cost-Effective Solution

What Is The Effect Of Laser Power On Welding?

Objective: to master the selection principle of laser power and its influence on welding quality in the process of laser welding.

Read this article with the following questions:

  1. What is the weld forming factor? How to calculate?
  2. What is the basis for selecting laser output power during laser welding?
  3. What is the effect of decreasing laser output power on weld penetration and achievable welding speed?

1. Principle of double beam welding

Classification of laser welding

1) According to power density and weld formation characteristics:

  • Heat conduction welding: power density (laser output power / focal spot area) < 105W/cm2
  • Deep penetration welding: power density > 106W/cm2

2) According to the laser output mode:

  • Pulse laser welding
  • Continuous laser welding

Schematic diagram of pulsed laser welding and continuous laser welding

Fig. 1 Schematic diagram of pulsed laser welding and continuous laser welding

2. Selection of laser power P

The selection of P is determined according to the plate thickness. P determines the spot power density and can control the penetration depth and welding speed.

Curve of power density and metal temperature with time

Fig.2 Curve of power density and metal temperature with time

3. Effect of laser power on penetration

As shown in the figure below, the greater the power P/kw, the deeper the penetration, and vice versa.

Relationship between laser penetration and power

Fig. 3 Relationship between laser penetration and power

4. Influence of laser power on welding speed

Supplementary knowledge points:

Form factor (of the weld) is defined in GB / t3375-1994 as:

During fusion welding, the ratio of weld width (B) to calculated weld thickness (H) on the cross-section of a single weld( φ= B/H), see Fig. 4 below.

When the weld forming factor is small, a narrow and deep weld will be formed.

In the center of the weld, due to regional segregation, more impurities will accumulate and poor thermal crack resistance, so the value of the forming factor cannot be too small.

For example, the forming factor of the weld should be greater than 1.3, that is, the width of the weld should be at least 1.3 times the calculated thickness of the weld.

Laser power and speed determine the forming of weld

Fig. 4 Laser power and speed determine the forming of weld

Relationship between welding speed and laser power

Fig. 5 Relationship between welding speed and laser power

5. Relationship between laser power, welding speed and penetration

Changes of penetration and welding speed of low carbon steel under different power

Fig. 6 Changes of penetration and welding speed of low carbon steel under different power

Summary:

The laser welding power determines the spot power density, and controls the welding penetration depth and welding speed;

With the increase of laser power, the welding speed and penetration can be increased.

Sharing is caring!

Get In Touch

If you want to get the quotation or have any questions, pls feel free to get in touch with us.

Leave a Comment

Your email address will not be published. Required fields are marked *

error: Content is protected !!
Scroll to Top

Keep in touch

Fill in your details and we’ll get back to you in no time.