CN111390384A

CN111390384A - Wire-filling-free laser fusion welding method applied to commercial car roof cover

Info

Publication number: CN111390384A
Application number: CN202010228380.XA
Authority: CN
Inventors: 彭惠平; 张威
Original assignee: Jiangling Motors Corp Ltd
Current assignee: Jiangling Motors Corp Ltd
Priority date: 2020-03-27
Filing date: 2020-03-27
Publication date: 2020-07-10

Abstract

The invention discloses a wire-filling-free laser fusion welding method applied to a commercial car roof, which ensures the position accuracy of a car body roof through a tool fixture, and simultaneously utilizes a laser welding system to accurately focus laser welding spots on the positions of welding seams, melt base metal of the car roof and side walls of the car roof, and form connecting metal welding seams after cooling. The welding method has stable and reliable welding quality, and the welded product meets the endurance fatigue test standard of the whole vehicle; meanwhile, the welding process without wire filling can avoid the shutdown of welding equipment caused by the faults of a wire feeding mechanism and welding wire related equipment, reduce the spare part cost and equipment maintenance cost of a factory, bring more benefits and is suitable for popularization and use in more fields.

Description

Wire-filling-free laser fusion welding method applied to commercial car roof cover

Technical Field

The invention relates to the technical field of production line processes, in particular to a wire-filling-free laser fusion welding method applied to a commercial car roof.

Background

At present, the laser welding process of the domestic commercial vehicle top cover adopts lap joint filler wire fusion welding, the welding method must consider investment on a welding wire conveying system and consumption of consumable materials of welding wires, and meanwhile, the defect of wire stop loss caused by switching new welding wires after the welding wires are used up exists, and the efficiency of a production line and the use cost of the welding system are influenced.

Based on the consideration, the invention designs a welding process and welding specification without wire filling on the basis of mass data verification.

Disclosure of Invention

The technical scheme adopted by the invention is as follows:

a no-filler wire laser fusion welding method applied to a commercial car roof cover comprises the following steps:

s1: the conveying system conveys the car body without the welded top cover to a station, and the station tool fixes the car body and the top cover on a tool fixture;

s2: the tool fixture accurately positions the vehicle body and the top cover to be welded;

s3: the laser welding system accurately focuses laser welding spots on the positions of welding seams;

s4: the laser beam melts the base metal of the car roof and the side wall thereof to form a welding pool, and the welding seam is formed after the metal of the welding pool is cooled.

The laser welding system comprises a laser welding room, a welding robot, a laser generator Y L S-4000TtuDisk, a laser welding head SCANSONIC A L O3, a ball skid conveying system, a vehicle body positioning system, a vision system and a welding seam tracking system.

The laser power used by the laser welding system is 3KW +/-5%, and the pressure of the rolling wheel is 140N +/-15%.

The laser spot size of the laser beam is 2.2mm, and the welding speed is 4.2 m/min.

The laser light spots cover 60% of the top cover, and 40% of the laser light spots cover the lower side wall outer plate overlapped with the top cover.

The invention has the beneficial effects that:

1. the welding process method without wire filling can save welding wire loss, and the cost of a single vehicle body is reduced by 9.2 yuan.

2. The welding system applied by the invention can reduce the investment of welding wire feeding equipment, one set of system can reduce the investment by 40-60 ten thousand yuan, and the shutdown caused by the fault of the wire feeding equipment and the shutdown of a production line caused by the switching of welding wires are avoided.

Drawings

FIG. 1 is a schematic view of a welding process of a non-filler wire laser fusion welding method applied to a commercial vehicle roof cover according to the present invention.

Detailed Description

The invention is further described below with reference to the figures and examples.

Example (b): see fig. 1.

At a welding station of a top cover of the automobile body, a conveying system conveys the automobile body without the welded top cover to the station, a station tool fixes the automobile body and the top cover on a clamp, seven welding robots on two sides of the automobile body move a laser welding head to the position near a welding position, when welding starts, laser irradiates a welding position through a light spot conducted by an optical fiber, as shown in figure 1, the high temperature of the laser beam melts an upper base material and a lower base material to generate a plasma jet flow and a key hole to form a welding pool, and as the robot moves in the length direction of the automobile body, the metal of the welding pool cools to form a welding seam.

Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the invention.

Claims

1. A no-filler wire laser fusion welding method applied to a commercial car roof cover comprises the following steps:

2. A wire-less laser fusion welding method applied to commercial roofs according to claim 1, wherein said laser welding system comprises a laser welding house, a welding robot, a laser generator Y L S-4000 ttudink, a laser welding head SCANSONIC a L O3, a ball skid delivery system, a vehicle body positioning system, a vision system and a weld tracking system.

3. A method of non-filler-wire laser fusion welding for commercial vehicle roofs according to claim 1, wherein said laser welding system uses a laser power of 3KW ± 5% and a rolling wheel pressure of 140N ± 15%.

4. A method of non-filler-wire laser fusion welding for commercial vehicle roofs according to claim 1, wherein the laser spot size of said laser beam is 2.2mm and the welding speed is 4.2 m/min.

5. A filler-less laser fusion welding method for commercial vehicle roofs as set forth in claim 3, wherein said laser spot is 60% covered on said roof and 40% covered on said under-side outer panel overlapped with said roof.