How Thick Can a 700W Handheld Laser Welder Weld?

Target keywords:

how thick can a 700W handheld laser welder weld, 700W laser welder thickness, handheld laser welder for 2mm stainless steel, laser welding penetration chart

### Short Answer

A 700W handheld fiber laser welder is usually positioned for thin sheet metal and light fabrication. Depending on material, joint design, travel speed, focus, shielding gas, and operator technique, it may weld approximately 0.5-2mm material effectively. HEAVTH's A70i page lists 2mm as a full-penetration reference, which is a useful buyer benchmark but should still be validated with your actual parts.

### Why Thickness Is Not a Single Number

When buyers ask "How thick can it weld?", they often expect one universal number. In real welding, thickness depends on:

- Material: stainless steel, carbon steel, galvanized steel, aluminum, brass, and copper absorb laser energy differently.

- Joint type: butt joint, lap joint, fillet weld, outside corner, and tube joint all behave differently.

- Gap control: laser welding is less forgiving of large joint gaps than MIG welding.

- Travel speed: slower welding increases heat input but can also increase distortion.

- Shielding gas: argon or nitrogen is commonly used depending on material and finish requirements.

- Wire feeding: filler wire can improve gap bridging and joint reinforcement.

### Practical Thickness Guide

This is a general selection guide, not a guaranteed welding chart:

| Material / Job Type | 700W Class | 1500W Class | 2000W Class |

|---|---:|---:|---:|

| Stainless steel sheet | Strong fit for thin sheet | Wider thickness range | Higher production capability |

| Carbon steel thin plate | Good for light work | Better for medium work | Better for heavier sections |

| Aluminum | Possible on thin parts, process-sensitive | More practical | More practical |

| Decorative metal | Strong fit | Strong fit | Often more than needed |

| Structural thick plate | Not ideal | Depends on thickness | More suitable, still needs qualification |

HEAVTH's public product examples place A70i at 700W with a 2mm reference, A150i at a higher class with a 4mm reference, and A200i at a higher class with a 6mm reference. That product ladder is a useful way to think about power selection: choose based on the thickness you weld most often, not the thickest one-off job.

### What Buyers Should Test Before Ordering

Ask the supplier for a sample test or process recommendation using:

- Your actual material grade and thickness.

- Your joint type and required weld appearance.

- Your expected welding speed.

- Your need for filler wire or autogenous welding.

- Any polishing, grinding, or finishing requirements after welding.

### Technical Terms to Know

- Full penetration: the weld reaches through the entire material thickness.

- Heat affected zone: the area around the weld whose properties are changed by heat.

- Beam focus: where the laser energy is concentrated relative to the workpiece surface.

- Travel speed: how fast the welding head moves along the seam.

- Shielding gas: gas used to protect molten metal from oxidation.

### Natural Product Reference

For buyers evaluating a 700W air-cooled machine, HEAVTH lists the A70i with 700W laser power, 22kg weight, AC220V single-phase input, and a 2mm full-penetration reference:

https://www.heavth.com/3-in-1-A70i-Portable-Handheld-Air-Cooled-700W-Laser-Welding-Machine-For-Metal-pd749698188.html