HVAC technicians have long relied on brazing and soldering to join and repair copper and steel parts. A handheld fiber laser welder is another option. It puts heat into a very small area, which matters when you are working beside insulation, tubing and wiring. This article covers where a refrigeration handheld fiber laser welder fits in HVAC repair and maintenance, and where to be careful.
These portable welders let a technician work in tight spaces, leave little residue and spend less time on cleanup. In a big city, where jobs often happen in basements, on rooftops and in utility rooms, that portability counts. A shop can also pair them with a metal laser cutting machine to prepare parts before they go into the field.
Where a laser welder improves on traditional methods
Brazing and soldering have served HVAC well for decades, but they have drawbacks:
- Heat spreads to nearby components.
- Flux leaves residue that needs cleanup.
- Tight spaces are hard to reach with a torch and gear.
A handheld fiber laser welder has a compact torch and a built-in refrigerant cooling system, so there is no water tank to carry. The torch of the Ascent refrigeration laser welders weighs 1.32 lb (600 g), and the cable can reach 10 m or 15 m, so a technician can work inside ductwork, under units or in cabinets without a bulky setup.
What technicians value
Little heat spread
The laser focuses its heat on a small spot, which reduces damage to nearby parts such as insulation and electrical lines.
Clean welds
A laser weld is neat and has no flux residue, so there is less cleanup after the repair.
Portable and fast
The cooled laser, power source and controls sit in one unit on a trolley. That makes the welder easy to move between jobs. A shielding gas cylinder, usually argon, rides on the same trolley.
Several metals
The Ascent welders weld aluminum, stainless steel, carbon steel and other metals. Copper is more difficult, because it reflects laser light and carries heat away quickly, so check the thickness limits for your model. The capability tables on the product pages list the maximum thickness for each metal.
Easier to learn
A trained operator can produce consistent welds with a simple three-knob control. Ascent's training takes 3-4 hours. The operator remains responsible for completing the required training, following approved process controls and meeting every laser-safety requirement.
HVAC jobs to consider
- Sheet metal and housings. Repairs to cabinets, panels and ductwork.
- Brackets, fittings and mounts. Joining or building up parts with filler wire.
- Aluminum parts. Thin aluminum with low distortion.
- Field maintenance. On-site repairs where a brazing cart is awkward to bring in.
Before any heat is applied near refrigerant lines, the refrigerant must be recovered and the line cleared, and the repair must follow EPA and local rules. Check what the work requires before you decide whether a laser weld is appropriate for a given joint.
Features that fit field work
- A light torch that is easy on the wrist
- A wire feeder that feeds and retracts wire automatically
- A refrigeration heat pump with two circuits and no water, designed to run continuously
- Operation in ambient temperatures from -20°C to +60°C (-4°F to +140°F)
- An Android app and a three-knob control for settings
Using it in a city job
In dense urban areas, you may not be able to bring a brazing cart up an elevator or a narrow stairwell. A laser welder fits in a van and rolls on its trolley. It does need shielding gas, laser safety gear and a power supply, so plan for those before you go.
Cost and value
A handheld laser welder costs more up front than a torch. Over time, shops that weld often can save on consumables, cleanup and setup. Whether it pays off depends on how often you use it, so compare it against your repair volume.
Safety and training
- Eye protection is required. Wear the OD 8 laser safety goggles that come with the machine, under the fiber laser helmet that also comes with it. Other people in the area need goggles too. Minimum OD 5; prefer OD 7 or 8.
- Control fumes. Use ventilation or a fume extractor.
- Get trained. Learn the settings and the right torch position.
- Maintain the machine. Keep lenses clean and check the torch alignment.
See our laser safety page for more.
Talk to Ascent Lasers Pro
For HVAC shops considering a handheld laser welder, Ascent Lasers Pro can match a model to your jobs. Installation and training at your facility are included in the price, the handheld welder has a 2-year warranty, and technicians support customers from Buffalo, Toronto and Kentucky. Contact us to learn more.
