Analysis of welding stability of quasi-continuous fiber laser

With the development of modern laser technology, the application of lasers in different industries has become more in-depth, which not only solves the shortcomings of traditional processing, but also makes many breakthroughs in the process.

At present, laser welding technology has been widely used in the 3C field, various types of mobile phone modules, mid-plate cover and other industrial manufacturing. In recent years, the rapid development of new energy vehicles, 3D printing and other industries has also made laser precision welding a new market demand.

Recently, regarding the stability of precision welding, Chuangxin laser welding engineers specially made relevant experimental analysis.

experimental method

Use Chuangxin Laser's MFQS-150W/1500W quasi-continuous fiber laser for precision spot welding of stainless steel. The laser spot welding experiment is carried out on the scanning galvanometer laser welding platform, using side-axis auxiliary gas protection. In the case of different laser peak powers (300W, 600W, 900W, 1200W, 1500W), optimize the light waveform and process parameters to ensure the quality of welding joints. Point size, analysis of solder joint uniformity and laser light stability.

Figure 1 Diagram of 50 solder joints on a stainless steel sheet

Figure 2 Enlarged view of solder joints

Experimental results

1. Experimental results when the laser peak power is 300W

1) Test waveform

2) The size (mm) of 50 solder joints on stainless steel is as follows:

3) Chart analysis

4) Conclusion: The solder joint size range is 1.1~1.3mm, the average solder joint size is 1.22mm, the solder joint fluctuation is 9.8%, the solder joint is uniform, and the light is stable, which can meet the needs of precision welding.

2. Experimental results when the laser peak power is 600W

1) Test waveform

2) The size (mm) of 50 solder joints on stainless steel is as follows:

3) Chart analysis

4) Conclusion: The solder joint size range is 1.79~2.1mm, the average solder joint size is 1.94mm, the solder joint fluctuation is 8.2%, the solder joint is uniform, and the light is stable, which can meet the needs of precision welding.

3. Experimental results when the laser peak power is 900W

1) Test waveform

2) The size (mm) of 50 solder joints on stainless steel is as follows:

3) Chart analysis

4) Conclusion: The solder joint size range is 2.3~2.57mm, the average solder joint size is 2.48mm, the solder joint fluctuation is 7.2%, the solder joint is uniform, and the light is stable, which can meet the needs of precision welding.

4. Experimental results when the laser peak power is 1200W

1) Test waveform:

2) The size (mm) of 50 solder joints on stainless steel is as follows:

3) Chart analysis

4) Conclusion: The solder joint size range is 2.43~2.97mm, the average solder joint size is 2.76mm, the solder joint fluctuation is 7.6%, the solder joint is uniform, and the light is stable, which can meet the needs of precision welding.

5. Experimental results when the laser peak power is 1500W

1) Test waveform

2) The size (mm) of 50 solder joints on stainless steel is as follows:

3) Chart analysis

4) Conclusion: The solder joint size range is 2.67～3.12mm, the average solder joint size is 2.89mm, the solder joint fluctuation is 7.6%, the solder joint is uniform, and the light is stable, which can meet the needs of precision welding.

Summarize

Through the analysis of the experimental results, it can be seen that when the peak laser power is 300W, 600W, 900W, 1200W, 1500W, the fluctuation of the solder joint size is maintained within 8%, the energy is concentrated and stable, and the solder joints are uniform, which can well meet the needs of consumer electronics. Product precision spot welding and repair welding of gold and silver jewelry, such as electronic product shells, shielding covers, USB connectors, conductive patches, gold and silver jewelry, etc.

The advantages of quasi-continuous fiber lasers:

1: Whole machine mode, no need for customers to perform 2 integrations;

2: Air-cooled cooling method, reducing water-cooled machines;

3: Built-in waveform software editing function;

4: Compatible with analog signal control;

5: Simple structure, small size and light weight;

6: Good beam quality and high energy stability;

7: Optical fiber structure, long life.