How to Choose Welding Wire for Fiber Laser Welding Machines

If you run a fiber laser welding machine, the wire is half the job. Pick wrong and you get spatter, porosity, cold lap, or a weld that looks fine but fails later.

First, match the wire to your base metal. For 304 stainless, use ER308L. For 316, ER316L. Carbon steel like Q235 takes ER70S-6. Aluminum 6061 works with ER4043; 5083 is better with ER5356. Brass needs HS221. Mismatched chemistry leads to cracks, poor corrosion resistance, or weak joints.

Second, match wire diameter to plate thickness. Thin plate needs thin wire. 0.5–1.5 mm plate: 0.8 mm wire. 1.5–3.0 mm: 1.0 mm. 3.0–4.5 mm: 1.2 mm or 1.6 mm. For thick plate with high filler demand, dual 1.0 mm wires can help.

Third, match wire diameter to laser power. 0.8 mm wire around 1000W. 1.0 mm for 1500–2000W. 1.2–1.6 mm or dual feed for 2000–3000W and above. Too thin risks burn-through. Too thick causes incomplete fusion.

Then check wire quality before loading. Wipe with alcohol—the cotton should stay white. No rust; the wire should be bright silver or metallic. Copper coating should be under 0.5%. Store wire sealed and dry. Dirty or damp wire feeds badly and welds worse.

If your machine also has a cutting function, you do not need filler wire when cutting. Use argon or nitrogen at 15 L/min or higher. Check nozzle and focal position. Cutting parameters are different from welding, so follow your machine manual.

The short version: match material, thickness, and power. Test a sample before a full batch. If you are unsure, send your base metal, thickness, and machine power to our engineering team. We will help you choose the right wire and settings.