Fiber Laser Welder
Training & Guides

Fiber laser welders can weld stainless steel, mild steel, carbon steel, aluminum, copper, brass, and galvanized steel. Copper and brass require higher power settings and wobble welding mode. Aluminum requires clean, oxide-free surfaces and often a nitrogen purge to prevent porosity.

Wobble mode oscillates the laser beam in a circular or figure-8 pattern as it travels along the weld joint. This widens the effective weld pool without reducing travel speed, improving gap bridging (up to 1–2mm gaps), reducing porosity on reflective metals, and producing a wider, flatter bead that requires less post-weld grinding.

Not always. Autogenous (no filler) welding works well on tight, well-fitted butt joints in stainless steel and mild steel under 3mm. Filler wire becomes necessary when bridging gaps over 0.3mm, welding thicker materials, or welding aluminum. The 3-in-1 machines include integrated wire feeders for this purpose.

Argon is the standard shielding gas for fiber laser welding — it produces the cleanest welds on stainless, mild steel, and aluminum. Nitrogen is an acceptable alternative for stainless steel but can cause porosity on carbon steel. For highest quality results, use pure argon at 15–20 L/min flow rate.

Cleaning mode uses a defocused, rapidly oscillating laser beam to ablate surface oxides, rust, paint, and contaminants without removing base metal. Ideal for weld seam preparation on rusty or painted steel, post-weld oxide removal on stainless, and cleaning aluminum before welding. Rise Tek's 3-in-1 fiber laser welder includes cutting, welding, and cleaning in one unit.

Porosity in laser welds is most commonly caused by: (1) contamination — oil, moisture, or oxides on the base metal; (2) insufficient shielding gas coverage or flow rate; (3) welding aluminum without wire (solidification cracking); (4) incorrect focus position causing keyhole instability. Clean the joint with acetone, confirm gas flow at 15–20 L/min, and verify focal offset for your material thickness.

Fiber laser welding is 3–5× faster than MIG on thin sheet metal under 4mm, produces significantly less heat distortion, requires minimal post-weld grinding on stainless, and produces narrow, consistent weld beads. MIG remains better for thick plate over 8mm, structural work, and situations where gap tolerance cannot be tightly controlled.

Butt joints and lap joints work best for laser welding — tight fit-up is critical (under 0.3mm gap for autogenous welding). T-joints are possible but require careful positioning. Gaps over 0.5mm require wire feed and/or wobble mode. Poor fit-up is the single biggest source of quality problems in fiber laser welding.