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Laser Welding | Laser-arc Hybrid Welding Technology

Release Date : 11/01/2018 Views : 698
In the production process of New Audi A8 Automobile, it applies the Laser-arc hybrid welding technology in using the joint of different standard and formats on its side beam.

Here is the brief introduction for Laser-arc Hybrid Welding Technology.

Laser-arc hybrid welding is a welding method that combines Laser heat source with electric arc as second heat source composited in one molten pool. Laser-arc hybrid welding is advantageous for high adaptability of Laser-arc welding and melting depth and high speed and low deformation of Laser welding. The Arcs in Laser-arc hybrid welding include TIG, plasma arc and GMA arc, gas metal-arc welding including MIG and MAG. Laser-GMA arc hybrid welding is currently the most popular one that is widely applied and used.
 

 Schematic of Laser-arc Hybrid Welding

Process analysis of Laser Arc Hybrid Welding: for a better gap adaptability, compared with Laser fusion welding, we create wider melting width and deeper melting depth in the interaction of Laser and arcs that increased the efficiency. And it can apply in multi-channel and multi-layer welding in the thick plates. Therefore the application of the Laser hybrid welding has grown in wider range.

When you use Laser-arc hybrid welding, there is another heat source like arc except the traditional Laser heat source that is renowned. The production of Laser-arc is a discharging phenomenon that when there is the rated voltage between the electrodes and base metal, arc will stable and everlasting be made in the gas medium supplied by welding electric power.

The essence of the welding arc is similar to the flash that happens in the stormy and humid weather but Laser-arc in welding can be under control. Usually the combination of heat source and Laser has TIG welding and MIG welding. The biggest difference between TIG and MIG is the different electrode when discharging the arc. The electrode of TIG is made of tungsten pin. Why we choose tungsten? Its high temperature melting point stops the continuing consumption of the raw material and at the same time the additive solder materials will be supplied. MIG, Metal Inert Gas, feeding wire by nozzle when producing Laser-arc, the ending part of the welding wire electrode will self-melted and becomes the part of welding line in the melt pot. 

 
Power supply is from Laser-arc power source when it is welded. Two poles of Laser-arc power supplies, positive and negative, form into a loop connected by the installed electrode from workpiece and welding gun and ignited the Laser-arc and maintained the stable inflammation of the Laser-arc. Differentiated from normal power supply, Laser-arc power source can reach hundreds of ampere and is a low voltage and large current power source. The maximum welding current for Laser-arc electric power can reach up to 500A for Fronius T PS5000 Laser-arc power source but normal welded voltage is under 100 volt. We have three Laser-arc power source like DC Power supply, AC Power supply and pulse power supply. When in arc welding, the key technic parameter like pulse frequency and pulse peak is from welding current and welding voltage and there will be parameter adjustments in joining the welded head of pulse welding Fronius Laser composite welding, MIG.

When in Laser-arc welding, the melting depth and its excess weld metal was affected by the welding current. Amplification of welding current and arc push force and heat input and transitional change for heat source are advantageous for in-depth heat conduction and increase the melting depth with more heat conduction to balance the wire feeding amount and wire melting amount.

In addition, when in MIG welding, the welding current is related to the diameter of the welding wire and when it is stable current, thinner welding wire will create quicker wire feeding speed, vice versa. When amplifying the current, the increase of the arc column diameter will be widen for the melting width. But when the depth of arc sneaking into the workpiece increases, the moving range of arc spot is limited therefore the slightly decrease of melting width is below the average of the melting depth. In the Laser-arc welding, when there is excessive current, normally there will be more technical problems.



 
In the production process of New Audi A8 Automobile, it applies the Laser-arc hybrid welding technology in using the joint of different standard and formats on its side beam.

Here is the brief introduction for Laser-arc Hybrid Welding Technology.

Laser-arc hybrid welding is a welding method that combines Laser heat source with electric arc as second heat source composited in one molten pool. Laser-arc hybrid welding is advantageous for high adaptability of Laser-arc welding and melting depth and high speed and low deformation of Laser welding. The Arcs in Laser-arc hybrid welding include TIG, plasma arc and GMA arc, gas metal-arc welding including MIG and MAG. Laser-GMA arc hybrid welding is currently the most popular one that is widely applied and used.
 

 Schematic of Laser-arc Hybrid Welding

Process analysis of Laser Arc Hybrid Welding: for a better gap adaptability, compared with Laser fusion welding, we create wider melting width and deeper melting depth in the interaction of Laser and arcs that increased the efficiency. And it can apply in multi-channel and multi-layer welding in the thick plates. Therefore the application of the Laser hybrid welding has grown in wider range.

When you use Laser-arc hybrid welding, there is another heat source like arc except the traditional Laser heat source that is renowned. The production of Laser-arc is a discharging phenomenon that when there is the rated voltage between the electrodes and base metal, arc will stable and everlasting be made in the gas medium supplied by welding electric power.

The essence of the welding arc is similar to the flash that happens in the stormy and humid weather but Laser-arc in welding can be under control. Usually the combination of heat source and Laser has TIG welding and MIG welding. The biggest difference between TIG and MIG is the different electrode when discharging the arc. The electrode of TIG is made of tungsten pin. Why we choose tungsten? Its high temperature melting point stops the continuing consumption of the raw material and at the same time the additive solder materials will be supplied. MIG, Metal Inert Gas, feeding wire by nozzle when producing Laser-arc, the ending part of the welding wire electrode will self-melted and becomes the part of welding line in the melt pot. 

 
Power supply is from Laser-arc power source when it is welded. Two poles of Laser-arc power supplies, positive and negative, form into a loop connected by the installed electrode from workpiece and welding gun and ignited the Laser-arc and maintained the stable inflammation of the Laser-arc. Differentiated from normal power supply, Laser-arc power source can reach hundreds of ampere and is a low voltage and large current power source. The maximum welding current for Laser-arc electric power can reach up to 500A for Fronius T PS5000 Laser-arc power source but normal welded voltage is under 100 volt. We have three Laser-arc power source like DC Power supply, AC Power supply and pulse power supply. When in arc welding, the key technic parameter like pulse frequency and pulse peak is from welding current and welding voltage and there will be parameter adjustments in joining the welded head of pulse welding Fronius Laser composite welding, MIG.

When in Laser-arc welding, the melting depth and its excess weld metal was affected by the welding current. Amplification of welding current and arc push force and heat input and transitional change for heat source are advantageous for in-depth heat conduction and increase the melting depth with more heat conduction to balance the wire feeding amount and wire melting amount.

In addition, when in MIG welding, the welding current is related to the diameter of the welding wire and when it is stable current, thinner welding wire will create quicker wire feeding speed, vice versa. When amplifying the current, the increase of the arc column diameter will be widen for the melting width. But when the depth of arc sneaking into the workpiece increases, the moving range of arc spot is limited therefore the slightly decrease of melting width is below the average of the melting depth. In the Laser-arc welding, when there is excessive current, normally there will be more technical problems.



 
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