Answers To 10 Common Questions about Handheld Laser Welding!

Answers to 10 common questions about handheld laser welding!

In recent years, handheld laser welding equipment has shown a booming development trend. With its many advantages such as portable and lightweight size, flexible welding methods, simple and easy operation and excellent welding quality, it has gained recognition and love from the market and users.

With the expansion of the market and the growth of sales, laser handheld welding has benefited more and more industries. Although the operation of handheld laser welding is very smart and easy to use, you may encounter some small questions during use. This article shares solutions to the top ten common problems.

01. What to do if the red light is not centered?

Cause analysis and solution: After the whole machine is powered on, the red light should be located at the center of the copper nozzle under normal circumstances. If there is a lateral offset, the software zero point correction can be used to solve it. If the left and right offset is large, or there is an up and down offset, the galvanometer position can be adjusted.

After adjustment, the red light is centered

02. The light is very strong at the beginning, and then gradually weakens.

Cause analysis and solution: The protective lens is burned out: During continuous high-power welding, welding slag will splash onto the lower surface of the protective lens. The laser hitting the welding slag will absorb energy and form a fireball, so the laser energy reaching the nozzle position will be weakened, resulting in the welding workpiece being not welded through.

Focusing lens burns out: When moving dust falls onto the focusing lens surface inside the focusing lens cavity, the laser beam absorbs energy when hitting the dust to form a small fireball, causing the surface temperature of the welding gun head shell to rise, and the energy of the focused beam decreases accordingly, and the laser energy reaching the nozzle position is weakened, resulting in the welding of the workpiece being opaque and weak light.

Troubleshooting: Replace the damaged lens

03. What to do if the copper nozzle is burned?

Cause analysis and solution:

1. During the welding process, heat diffuses to the copper nozzle and causes damage. The processing process should first: analyze the heat source, lens astigmatism, red light polarization or external material heat conduction.

2. Before processing, ensure

① The red light is centered (polarization will cause the light to hit the copper nozzle);

② Appropriate scanning width (generally within 4mm, usually set to 3mm);

③ Focus 0 focus.

3. Troubleshooting

① First, send light to the ground from a long distance to see if the copper nozzle is hot. If it is not hot, it means that there is no problem with the lens and no astigmatism. If it is hot, the damaged lens needs to be replaced.

② If the welding is hot under the above normal conditions, it means that the material is conducting heat during welding. In actual use, the outer corner copper nozzle is more easily damaged than the inner corner, and it can be replaced with a copper nozzle. (The materials of the current copper nozzles are brass and copper)

③ The welding technique also affects the heating. Try to weld the welding head and the material at 45°∠.

④ Highly reflective materials such as aluminum plates will also cause the copper mouth to become hot, which is uncontrollable.

04. What to do if the protective lens is burned?

Cause analysis and solution: Due to the influence of process, welding technique, parameter setting, etc., the anti-slag causes damage, or the laser is abnormal; the welding head lens is dirty; Troubleshooting:

① Appropriately increase the air flow, the air pressure value is not less than 15L/min, reduce the swing frequency, it is recommended to use 50hz, and the swing width is 2-3mm;

② Try to ensure that the welding gun and the plate are 45°∠ welding during welding;

③ Under high power, the lens loss will increase, this needs to be noted;

④ It is recommended to defocus welding to prevent splashing and damage to the lens.

05. The safety lock is connected, the gun head does not touch the welding material, and the light comes out directly?

Cause analysis and solution: Check whether there is a connection between the ground wire and the welding table on site. If so, it is equivalent to the safety lock being clamped at the gun rod, and the state of direct connection. Most customers use metal tables, which are easily connected to the ground wire. You can use a wooden table or a template on the foot pad to isolate it.

06. What to do if wire feeding is not smooth?

Cause analysis and solution: During welding, wire feeding is not smooth, resulting in the phenomenon of wire jamming during welding, and the overall weld is uneven and unsightly.

Troubleshooting:

① Keep the wire feeding tube as straight as possible to avoid bending and winding;

② Select a wire feeding wheel with matching wire diameter. The U-shaped wheel is suitable for aluminum wire and the V-shaped wheel is suitable for steel wire;

③ The value of the wire feeding pressure rod is adjusted to a suitable value according to the wire diameter.

07. Can the welding process library be detailed enough for each welding method?

Cause analysis and solution: The unique streamlined parameter interface matches the corresponding welding parameters according to the selection of different materials, different thicknesses, and different welding methods, thereby greatly reducing the parameter debugging time, improving the efficiency of workers, and simplifying the difficulty of welding.

08. Welding galvanized sheet explosion point problem

Cause analysis and solution: When welding galvanized sheet, the most obvious welding defects are surface pores and more welding spatter. When the situation is bad, welding may even be unformed. The reasons for this situation are:

① The boiling point of the metal element zinc is 907℃. A large amount of zinc element is vaporized during welding. Due to the short existence time of the molten pool during laser welding, the metal vapor does not float out of the molten pool or does not completely float out of the molten pool surface to form internal pores and surface pores.

② When welding fillet welds, zinc vapor is more difficult to overflow from the surface of the T-joint, or zinc metal vapor takes away a large amount of molten metal when overflowing, forming more obvious spatter or explosion holes.

Fault handling:

① Mechanically grind the zinc coating around the welding position, remove the zinc coating, and then weld. At this time, the welding state is close to carbon steel.

② Use a smaller power with a larger positive defocus barrel and high frequency welding. This can reduce the generation of welding spatter and pores, but the welding penetration will be affected.

09.Three methods of debugging fish scale pattern

Method 1: Enable fish scale pattern mode on the home page. The system has built-in fish scale pattern mode, and the default parameters have been set. Turn on the wire feeding function (first, confirm the continuous mode parameters and turn on the switch). 

Method 2: Enter the professional mode settings. Set reasonable burst duration and burst interval time. Burst duration: 150ms (this parameter affects the size of the welded pattern) Interval time: 40ms (this parameter affects the interval between two patterns). Use burst mode to debug fish scale pattern: wire feeding delay, wire filling distance, and retraction distance are adjusted to 0.

Method 3: Use pulse wire feeding mode (recommended) Wire feeder parameters select "pulse" pulse period: 140ms pulse wire feeding speed: 10mm/s pulse smoothness: 20-35% Notes on fish scale mode welding: Fish scale welding is recommended to be used at 50% power. If fish scale mode is used in high power scenarios, the welding angle should not be too large. It can be properly defocused, increase the air flow, reduce welding spatter, and extend the service life of the protective lens.

10. What about the communication alarm?

Cause analysis and solution: If the boot or use process, the communication alarm, the probability is that the gun head plate interface is loose, no signal is given, contact the manufacturer for after-sales treatment.