July 14, 2022 By author

Advantages of Laser Welding

Laser welding

https://www.hmlasercutter.com/ is a method of joining materials with different physical properties. Unlike conventional welding methods, https://www.hmlasercutter.com/ creates a smaller heat affected zone, resulting in less thermal distortion and reduced mechanical properties. It is used in the joining of MMCs with ceramic particles. The advantages of laser welding are described below. To learn more about laser welding, read the following articles:

Conduction mode

Laser welding is a process that involves the use of a high-energy, pulsed laser to weld metals. Laser energy is absorbed by a plasma that refracts, scatters, and heats. The formation of this plasma alters the welding process and weakens the weld. In order to avoid the formation of laser-induced plasma, shielding gas is used to blow down the plasma. This gas protects the molten pool from damage by the plasma.

The process simulations for conduction mode laser welding are based on a meshless Lagrangian smoothed particle hydrodynamics model. The solid phase is modeled based on thermoelasticity and surface tension effects, simulated melt flow in the weld pool, and the non-isothermal solid-liquid phase transition is included. The latent heat of fusion is also modeled, and the energy input is a Gaussian source of heat.

Keyhole mode

This article describes the keyhole weld mode of laser welding and discusses the factors that affect its performance. The keyhole mode is often considered to be a better alternative to conventional welding processes. This mode of laser welding is more effective in many applications, including automotive manufacturing. Its keyhole design allows the weld to be much narrower than a traditional welding process. The chevron pattern formed on the weld cap is a result of the chevron pattern.

When used in combination with other processes, laser welding in keyhole mode can achieve deep weld penetrations with the least amount of heat. The laser’s power density is between 106 and 107 W/cm2, which translates to spot sizes less than 0.010″. Keyhole mode welding melts the material directly in the target area while minimizing heat transfer into the material. This minimizes distortion and heat affected zones.

Fillet weld

A Fillet weld can be produced by either the MIG method or laser welding. MIG utilizes a continuously fed wire that adds material to the weld. This method is particularly good for fillet welds because the top sheet is less than 0.04 inch thick. Using a laser, the weld bead is concave in shape and a lower added filler material makes the transition from the base material to the weld bead much smoother.

A recent study focused on the effect of various parameters on the geometry of fillet welds, including the heat input and the inclination angle of the laser beam. The focal point position is crucial to the overall geometry of the weld. While the HLAW process produces a preferred concave top bead, a flat position (Figure 1) is easier to access. Hence, this welding position is commonly used in industrial applications.

Deep penetration mode

If you want to get the best results from laser welding, you must focus the beam properly. A low power laser will work in the single Gaussian mode, M2 = 1. But powerful industrial lasers will generate higher modes and larger spots. The main parameter to focus the laser beam is its focal length. And this must be above the threshold for deep penetration mode. Generally, a high power laser has the most intense beam in this mode.

The deep penetration laser welding model can be calculated by calculating the energy balance at keyhole walls. For this, a moving line source of heat was considered, and a formula for plasma absorption was derived. Moreover, the beam damping coefficient was estimated based on the plasma plume. The result was a model that could accurately predict the depth of laser welding. But deep penetration laser welding has a number of limitations.