Wat 10.000 lassen onthullen over de productiviteit van laserlassen

In science fiction, lightsabers help save the galaxy. In the real world, saving 20 seconds can make or break an empire. 

Twenty seconds sounds almost meaningless. Until it happens 10,000 times. Then it becomes more than 55 hours of production time, almost seven eight-hour shifts that could potentially be spent finishing another batch, reducing a backlog or starting the next customer project. 

Welding speed gets attention because it is easy to measure. Start the stopwatch. Make the weld. Stop the clock. But the customer is not paying for welding speed. They are paying for finished parts. And that changes the calculation. 

At a time when manufacturers are already struggling to add skilled welding capacity, it’s increasingly imperative to improve production productivity from the hours you already have. The European Labour Authority's report places welders and flame cutters among Europe's top shortage occupations.  

A Kemppi technical comparison of laser, MAG and TIG welding gives us a useful way to look at what that could mean. 

What did Kemppi compare? 

We compared laser, MAG and TIG fillet welds on 1, 2 and 3 mm steel plate. 

The tests measured: 

• welding speed  

• heat input  

• electrical energy consumption  

• shielding gas consumption  

• filler consumption  

For energy, shielding gas and filler, the results are based on a 200 mm test weld.  

The comparison does not mean the three processes are interchangeable. In particular, the resulting throat thicknesses differed between the tested welds, which is important when interpreting consumable use and other results. 

What the data does reveal is how dramatically the resource and time profile of a weld can change with the process. And that is where the business case begins. 

How much production time can welding speed actually release? 

Across the three plate thicknesses, measured welding speeds were: 

Under these test conditions, laser welding was approximately 1.5–2.1 times faster than MAG and around 8–10 times faster than TIG.  

Let's scale just one of the tests. For the 2 mm steel test, the exact measured speeds were 851 mm/min for laser, 571 mm/min for MAG and 107 mm/min for TIG.  

If a manufacturer had 10,000 welds of 200 mm each, those speeds translate approximately into: 

That means the measured laser speed would represent approximately 19 welding hours of released capacity compared with MAG in this example. 

Against TIG, the difference is approximately 272 welding hours. 

Note that this is a welding-time extrapolation from one controlled test, not a prediction of total production time or guaranteed FastBeam³ savings. Preparation, positioning, fit-up, safety procedures, inspection and other operations are not included, and the tested weld geometries differed. 

But it illustrates an important point. A few seconds per weld can add up to entire production shifts at scale. The business value of those hours depends on what you do with them. 

For instance, 19 hours could become another production batch, creating capacity for another customer project. Or it could allow experienced welders to spend more time on joints and applications that genuinely require their expertise. 

Where does laser welding fit in? 

If welding is the bottleneck, business growth can therefore depend on questions such as: 

• How many components can each available welding hour produce? 

• Which welds genuinely require the highest level of manual skill? 

• Can repetitive or suitable applications be completed differently so skilled welders can focus elsewhere? 

Laser welding does not eliminate the need for welding expertise. Process selection, joint design, material knowledge, quality control and safe operation remain critical. But in suitable applications, increasing output per welding hour can help manufacturers address the capacity problem from another direction. What happens when one minute disappears from every part? If a process improvement removes just one minute from every component, the annual capacity released becomes: 

At 100,000 parts, it is more than 200 eight-hour production shifts. 

And after the welding stops? 

Welding speed is only one place where production time can disappear. 

Another is rework. 

Low heat input is normally discussed as a technical welding characteristic. For the business case, however, the more interesting question is what lower heat input can mean downstream. 

In Kemppi's tests, laser heat input was substantially below MAG and TIG across all three tested plate thicknesses. For example, on the 2 mm plate it measured: 

• Laser — 0.048 kJ/mm 

• MAG — 0.189 kJ/mm 

• TIG — 0.287 kJ/mm 

That makes heat input interesting because lower thermal input can help reduce distortion in suitable applications.  

And distortion has a very real labour cost. TWI research into European shipbuilding reported that rework associated with inaccuracies and thermal distortion had been estimated at 15–30% of labour costs for new ship construction in some applications. TWI identified reduced distortion and reduced straightening and rework as one of the important economic motivations for laser and laser-hybrid welding in shipbuilding.  

Removing work after welding can sometimes create more value than making the weld itself faster. 

That is also why current laser-manufacturing research increasingly looks beyond raw process speed. Fraunhofer ILT describes industrial laser-production challenges in terms of shorter cycle times, lower scrap, reduced energy consumption, better material utilisation, process stability and reliable quality - all of which determine whether a high-speed process actually delivers value in series production.  

What happens to consumables when production scales? 

Then there are costs that seem small because they disappear a few grams or litres at a time. 

Based on Kemppi's 2 mm steel plate test, with a weld length of 200 mm:

Again, this should not be interpreted as a universal percentage saving because the weld throat thicknesses were different. In the 2 mm test, the recorded throat thicknesses were 0.8 mm for laser, 2.2 mm for MAG and 1.6 mm for TIG.  This is exactly why production-specific ROI matters. 

Once a manufacturer enters its real wire price, gas price and annual weld volume, grams and litres become extra expenditure. 

The ROI of laser welding 

For a manufacturer considering FastBeam³, the useful ROI equation needs more than welding speed. It should consider: 

• Production volume: How many relevant parts or metres of weld are produced annually? 

• Welding hours: How much operator time does the existing process require? 

• Preparation and fit-up: Does the application provide the joint consistency required by the process? 

• Finishing: How much grinding, cleaning or cosmetic work follows welding? 

• Distortion correction  How much labour is spent bringing welded parts back into tolerance? 

• Rework and scrap: How often does work have to be corrected or discarded? 

• Consumables: How much filler, gas and other consumable material does each process require? 

• Energy: What is the actual energy consumption per completed part? 

• Investment: What equipment, training, maintenance and laser-safety infrastructure are required? What is a released production hour worth to your business? 

Saving those same 100 hours in a workshop with a six-week backlog can allow the business to accept more orders without immediately adding another shift or welding station. 

That is where welding productivity can become commercial capacity. 

Three workshops. Three different laser welding business cases. 

Imagine three manufacturers considering the same technology. 

The high-volume subcontractor 

It makes thousands of similar sheet-metal assemblies with stable fit-up. 

Five or ten seconds repeated thousands of times matters. Faster welding, reduced consumable use and shorter downstream processing can combine into meaningful annual capacity. 

Its biggest opportunity may be throughput. 

The stainless-steel fabricator 

Volumes are lower, but visible weld quality matters. Significant labour goes into grinding, cleaning and correcting distortion. 

Its largest saving may not come from welding speed at all. 

It could come from reducing everything that happens after welding. 

The high-mix workshop 

It produces constantly changing components, small batches and joints with varying fit-up. 

Laser speed may look impressive in a demonstration, but the shop may not be able to exploit it on every job. MAG and TIG can remain the better choice for many applications. 

Its challenge is therefore finding the right laser applications, rather than replacing every existing process. 

Laser does not replace MAG or TIG 

A useful question is: Which parts of our production would create more value if we welded them differently? 

Kemppi's tests show that, under the tested conditions, laser delivered higher welding speeds, lower electrical energy consumption per 200 mm test weld, lower gas consumption and lower filler consumption than the corresponding tested MAG and TIG welds.  

Those figures do not tell every manufacturer to make the same decision. 

Instead, look at the welding seconds. Then multiply them by annual volume. 

Look at the finishing minutes, rework, the welding hours currently limiting production. 

Look at what another 20, 100 or 500 available hours could mean to the order book. 

Because the strongest business case is what your company can do with the time it gets back.