Handheld laser welding is revolutionizing metal fabrication with its speed, precision, and ease of use. However, achieving high-quality welds requires more than just setting power and speed.
This guide explains the key factors that affect weld quality, including shielding gas, laser focus, welding technique, and common troubleshooting methods.
Get a Quote for Laser Welding Machine →Shielding gas not only prevents oxidation but also directly affects the molten pool and weld bead shape.
Too much gas → porosity and spatter
Too little gas → oxidation and black welds
Adjust gas flow properly
Maintain the correct gas angle
Ensure stable gas coverage
Laser focus does not need to be on the surface. In most cases, defocusing improves results.
Recommended: -1mm to -3mm (below surface)
Zero focus: causes spatter and poor penetration
Tip: For aluminum and copper, use positive focus.
Welding fumes can damage both health and equipment.
Contaminate lenses → reduce laser power
Clog nozzle and gas channels
Cause unstable welding
Solution: Use fume extraction and clean components regularly.
Correct wire feeding is critical for weld strength.
Feed wire ahead of the welding direction
Ensure laser melts wire first
Improve fusion quality
Black welds are often caused by oxidation during cooling.
Keep gas flowing 2–3 seconds after welding
Increase gas delay setting
| Problem | Cause | Solution |
|---|---|---|
| Porosity | Excess gas flow | Reduce gas pressure |
| Black weld | Oxidation | Increase gas delay |
| Spatter | Wrong focus | Use negative defocus |
| Weak penetration | Focus too high | Lower focus |
Argon is the most commonly used shielding gas.
This is caused by oxidation. Keep gas flowing after welding.
-1mm to -3mm below the surface is recommended.
Yes, use positive focus for better results.