WO2018103076A1

WO2018103076A1 - Hybrid laser-arc welding method

Info

Publication number: WO2018103076A1
Application number: PCT/CN2016/109236
Authority: WO
Inventors: 孙振田; 马飞
Original assignee: 孙振田; 马飞
Priority date: 2016-12-09
Filing date: 2016-12-09
Publication date: 2018-06-14

Abstract

A hybrid laser-arc welding method, comprising the following steps: S1: workpiece surface treatment; S2: welding groove formation; S3: arc welding device connection; S4: laser welding device starting; S5: water mist quenching treatment; and S6: welding seam treatment. The hybrid laser-arc welding method can delay curing of a molten pool to prevent a welding rod from melting too much, thereby facilitating connection of two welded workpieces. By processing a workpiece by means of a grooving mode, the molten pool is filled in a welding groove, so that the size of the molten pool is reduced, redundant metal on the outer side of a welding seam is reduced, the surface of the welding seam is smooth, and the effects of higher durability and corrosion reduction are achieved.

Description

Laser arc hybrid welding method

Technical field

The invention relates to the field of welding technology, in particular to a laser arc hybrid welding method.

Background technique

The existing arc welding process has the following defects: 1. The molten pool is easy to cool rapidly during the welding process, resulting in the welding is not strong; 2. Due to the high welding time requirement, the operation is slightly slower, which will cause the welding rod to melt too much. If the molten pool is too large, it will cause waste of materials and unevenness of the welded joints. 3. The welds after welding are uneven, not strong, and are easily corroded due to large surface area.

Summary of the invention

It is an object of the present invention to provide a laser arc hybrid welding method to solve the problems set forth in the above background art.

To achieve the above object, the present invention provides the following technical solution: a laser arc hybrid welding method, the method comprising the following steps:

S1: Surface treatment of the workpiece: sanding is performed on the surface of the welded workpiece by using sandpaper to remove impurities on the surface, and then a layer of welding protective liquid is applied for protection;

S2: Open the welding groove: use a cutting machine to cut the welding groove on the surface of the workpiece, and then brush a layer of welding protective liquid, let stand for 5-10 minutes;

S3: connecting the arc welding device: disconnecting the power of the arc welding device, electrically connecting the cathode welding rod of the arc welding device, and electrically connecting the anode of the arc welding device to the workpiece;

S4: Start the laser welding equipment: align the workpiece to be welded with the welding groove, and then test the welding rod and the workpiece connected in the previous step at the position of the opened welding groove port. After the arc is generated, the welding rod is separated from the workpiece 1- 2 cm, then contact to release the arc, each contact time is controlled for 1-3 seconds, during the contact process, the electrode moves along the welding groove to the other end, while the arc welding is carried out, the laser welding equipment is turned on, and the control is performed. The laser beam follows the position of the arc, and when the electrode moves to the end of the welding groove, the power of the arc welding device and the power of the laser welding device are turned off;

S5: water mist quenching treatment: at the end of the previous step, the sprayer is turned on, and after the welding process is finished, the position of the welding tank is spray-cooled using a sprayer, and the treatment is performed for 1-3 minutes, after which the sprayer is turned off;

S6: Weld treatment: knock the coat on the surface of the weld groove with a hammer, and then polish the sides of the weld with a grinding device, dispose of the metal beads sputtered during the welding process, and then carry out corrosion protection on the surface. deal with.

2 . The laser arc hybrid welding method according to claim 1 , wherein in the step S1 , the surface of the workpiece is first polished by using M7 sandpaper, and then finely ground using M1.5 sandpaper. 8 .

Preferably, the cross section of the soldering groove in the step S2 is V-shaped or U-shaped.

Preferably, the welding protective liquid components used in the steps S1 and S2 are: 20% copper oxide powder, 10% aluminum powder, 50% dilute hydrochloric acid having a mass concentration of 12%, and 20% rosin powder.

Preferably, in the step S4, during the welding, the welding rod and the laser beam are kept inclined during the welding, the inclination angles should be equal, both are 70-80 degrees, and the error of the welding rod and the laser beam inclination angle is controlled within 10 degrees.

Preferably, the anti-corrosion treatment adopted in the step S6 is performed by means of electroplating or painting.

Compared with the prior art, the invention has the beneficial effects that the invention can delay the curing of the molten pool by adopting the method that the laser and the arc conform to the welding, which provides valuable time for the technician to operate, and because the molten pool delays curing, It can prevent the electrode from melting too much, and it is easy to connect two workpieces to be welded, so that it is stronger after welding. By processing the workpiece by slotting, the molten pool can be filled in the welding tank, thereby reducing the molten pool. The volume, which reduces the redundant metal on the outside of the weld, makes the weld surface flat and therefore more durable and reduces corrosion.

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, The described embodiments are only a part of the embodiments of the invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

Embodiment 1

The invention provides a technical solution: a laser arc hybrid welding method, the method comprising the following steps:

S2: Opening the welding groove: use a cutting machine to cut the welding groove on the surface of the workpiece, and then brush a layer of welding protective liquid, and let it stand for 5 minutes;

S4: Start the laser welding equipment: align the workpiece to be welded with the welding groove, and then test the welding rod and the workpiece connected in the previous step at the position of the opened welding groove port. After the arc is generated, the welding rod is separated from the workpiece by 1 cm. Then, the contact release arc is performed, and the contact time is controlled for 1 second each time, and the electrode is moved along the welding groove to the other end during the contact process, and the laser welding device is turned on to control the laser beam to follow the arc while the arc welding is being performed. The position moves, turning off the power of the arc welding equipment and the power of the laser welding equipment when the electrode moves to the end of the welding tank;

S5: water mist quenching treatment: at the end of the previous step, the sprayer is turned on, and after the welding process is finished, the position of the welding tank is spray-cooled using a sprayer for 1.5 minutes, after which the sprayer is turned off;

Wherein, in step S1, the surface of the workpiece is polished using M7 sandpaper, and then M1.5 is used. The sandpaper is finely ground. The cross section of the welding groove in step S2 is V-shaped or U-shaped. The components of the solder resist liquid used in the steps S1 and S2 are: 20% of copper oxide powder, 10% of aluminum powder, 50% of dilute hydrochloric acid having a mass concentration of 12%, and 20% of rosin powder. In the step S4, during the welding, the welding rod and the laser beam are kept inclined during the welding, the inclination angles should be equal, both are 70 degrees, and the error of the welding rod and the laser beam inclination angle is controlled within 10 degrees. The anti-corrosion treatment employed in step S6 is performed by electroplating.

Embodiment 2

S2: Opening the welding groove: use a cutting machine to cut the welding groove on the surface of the workpiece, and then brush a layer of welding protective liquid, and let it stand for 8 minutes;

S4: Start the laser welding equipment: align the workpiece to be welded with the welding groove, and then test the welding rod and the workpiece connected in the previous step at the position of the opened welding groove port. After the arc is generated, the welding rod is separated from the workpiece by 1.5 cm. Then, the contact release arc is performed, and the contact time is controlled for 2 seconds. During the contact process, the electrode is moved along the welding groove to the other end. At the same time as the arc welding is performed, the laser welding device is turned on to control the laser beam to follow the arc. The position moves, turning off the power of the arc welding equipment and the power of the laser welding equipment when the electrode moves to the end of the welding tank;

S5: water mist quenching treatment: at the end of the previous step, the sprayer is turned on, and after the welding process is finished, the position of the welding tank is spray-cooled using a sprayer for 2 minutes, after which the sprayer is turned off;

S6: Weld treatment: knock the coat on the surface of the weld groove with a hammer, then polish the sides of the weld with a grinding device, dispose of the metal beads sputtered during the welding process, and then The surface is treated with anti-corrosion treatment.

Wherein, in step S1, the surface of the workpiece is first polished using M7 sandpaper, and then finely ground using M1.5 sandpaper. The cross section of the welding groove in step S2 is V-shaped or U-shaped. The components of the solder resist liquid used in the steps S1 and S2 are: 20% of copper oxide powder, 10% of aluminum powder, 50% of dilute hydrochloric acid having a mass concentration of 12%, and 20% of rosin powder. In the step S4, during the welding, the welding rod and the laser beam are kept inclined during the welding, the inclination angles should be equal, both are 75 degrees, and the error of the welding rod and the laser beam inclination angle is controlled within 10 degrees. The anti-corrosion treatment used in step S6 is carried out by means of painting.

Embodiment 3

S2: Opening the welding groove: use a cutting machine to cut the welding groove on the surface of the workpiece, and then brush a layer of welding protection liquid, and let stand for 10 minutes;

S4: Start the laser welding equipment: align the workpiece to be welded with the welding groove, and then test the welding rod and the workpiece connected in the previous step at the position of the opened welding groove port. After the arc is generated, the welding rod is separated from the workpiece by 2 cm. Then, the contact release arc is performed, and the contact time is controlled for 3 seconds. During the contact process, the electrode is moved along the welding groove to the other end. At the same time as the arc welding is performed, the laser welding device is turned on to control the laser beam to follow the arc. The position moves, turning off the power of the arc welding equipment and the power of the laser welding equipment when the electrode moves to the end of the welding tank;

S5: water mist quenching treatment: at the end of the previous step, the sprayer is turned on, and after the welding process is finished, the position of the welding tank is spray-cooled using a sprayer for 3 minutes, after which the sprayer is turned off;

Wherein, in step S1, the surface of the workpiece is first polished using M7 sandpaper, and then finely ground using M1.5 sandpaper. The cross section of the welding groove in step S2 is V-shaped or U-shaped. The components of the solder resist liquid used in the steps S1 and S2 are: 20% of copper oxide powder, 10% of aluminum powder, 50% of dilute hydrochloric acid having a mass concentration of 12%, and 20% of rosin powder. In the step S4, during the welding, the welding rod and the laser beam are kept inclined during the welding, the inclination angles should be equal, both are 80 degrees, and the error of the welding rod and the laser beam inclination angle is controlled within 10 degrees. The anti-corrosion treatment adopted in step S6 is performed by means of electroplating or painting.

The above three sets of examples, the separate laser welding process and the separate arc welding process were compared, and a steel bar with a diameter of one centimeter was welded with a circular steel plate having a thickness of one centimeter and a diameter of 10 cm, and then the strength of the weld was separately performed. Determination, the following table is obtained:

It can be seen from the experimental data in the above table that the welding process of the present scheme has higher strength after welding, and therefore has a good promotion value.

While the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art The scope of the invention is defined by the appended claims and their equivalents.

Claims

A laser arc hybrid welding method, characterized in that the method comprises the following steps:

S1: Surface treatment of the workpiece: sanding is performed on the surface of the welded workpiece by using sandpaper to remove impurities on the surface, and then a layer of welding protective liquid is applied for protection;

S2: Open the welding groove: use a cutting machine to cut the welding groove on the surface of the workpiece, and then brush a layer of welding protective liquid, let stand for 5-10 minutes;

S3: connecting the arc welding device: disconnecting the power of the arc welding device, electrically connecting the cathode welding rod of the arc welding device, and electrically connecting the anode of the arc welding device to the workpiece;

S4: Start the laser welding equipment: align the workpiece to be welded with the welding groove, and then test the welding rod and the workpiece connected in the previous step at the position of the opened welding groove port. After the arc is generated, the welding rod is separated from the workpiece 1- 2 cm, then contact to release the arc, each contact time is controlled for 1-3 seconds, during the contact process, the electrode moves along the welding groove to the other end, while the arc welding is carried out, the laser welding equipment is turned on, and the control is performed. The laser beam follows the position of the arc, and when the electrode moves to the end of the welding groove, the power of the arc welding device and the power of the laser welding device are turned off;

S5: water mist quenching treatment: at the end of the previous step, the sprayer is turned on, and after the welding process is finished, the position of the welding tank is spray-cooled using a sprayer, and the treatment is performed for 1-3 minutes, after which the sprayer is turned off;

S6: Weld treatment: knock the coat on the surface of the weld groove with a hammer, and then polish the sides of the weld with a grinding device, dispose of the metal beads sputtered during the welding process, and then carry out corrosion protection on the surface. deal with.
A laser arc hybrid welding method according to claim 1, wherein in the step S1, the surface of the workpiece is first sanded using M7 sandpaper, and then finely ground using M1.5 sandpaper.
The laser arc hybrid welding method according to claim 1, wherein the cross section of the welding groove in the step S2 is V-shaped or U-shaped.
A laser arc hybrid welding method according to claim 1, wherein: The components of the solder resist liquid used in the steps S1 and S2 are: 20% copper oxide powder, 10% aluminum powder, 50% dilute hydrochloric acid having a mass concentration of 12%, and 20% rosin powder.
A laser arc hybrid welding method according to claim 1, wherein in the step S4, during welding, the welding rod and the laser beam are kept inclined during the welding, and the inclination angles should be equal, both 70-80. Degree, and the error of the inclination of the electrode and the laser beam is controlled within 10 degrees.
The laser arc hybrid welding method according to claim 1, wherein the anti-corrosion treatment adopted in the step S6 is performed by means of electroplating or painting.