Laser welding by LaserJob

Laser welding at LaserJob – precise connections with structure

LaserJob offers high-precision laser welding and micro welding for high-end metal joints – resilient, stable, and with minimal thermal impact. Whether fine microjoints or complex geometries in stainless steel: with modern laser technology, many years of experience, and high quality standards, we manufacture exactly to customer specifications – reliable from a batch size of 1. We understand the challenges of demanding projects and are by your side as a dedicated and solution-oriented partner.

Benefit from a reliable joining technique at the top level – flexible, seamless, and perfectly integrated into your manufacturing processes.

LaserJob – Your partner for precise laser welding of stainless steel and other metals.

We are industry experts

Adjustment to different component thicknesses: Variable welding penetration depths allow the weld seam to be optimally adjusted to the respective material strength. Thin sheets require a shallow welding depth, while thicker components require a greater welding depth to ensure a secure connection.
Optimization of strength and load capacity: The ability to precisely control the weld penetration depth allows the weld seam to be designed to optimally meet mechanical requirements (e.g., breaking force, vibration resistance). Especially in mixed joints such as steel and aluminum, a shallow but wide weld depth can minimize the build-up of unwanted brittle phases and transfer high forces.
Process reliability and quality: Die Kontrolle über die Einschweißtiefe sorgt für eine gleichbleibend hohe Schweißnahtqualität und Reproduzierbarkeit, was in der industriellen Fertigung entscheidend ist.

Reduced distortion and smaller heat-affected zone: Thanks to the targeted control of the welding depth, only as much energy as necessary is applied. This minimizes thermal distortion and the size of the heat-affected zone, which is particularly advantageous for precise or sensitive components.

With our precision welding and the smallest possible heat-affected zone, we get really precise and clean-looking weld seams. No additional work is needed.

Whether or not to add material depends on the requirements for the weld seam, the properties of the material, and the tolerances of the components. High-precision, clean, and fast connections are possible without filler material, but only with narrow gaps and suitable materials. With filler material, however, it is easier to weld difficult materials, larger gaps, and achieve higher seam quality.

We are happy to help you select the right weld for your project. If you have any questions, the fastest way to get answers is to give us a call.

It is our pleasure to manufacture for you in the customary LaserJob quality, even for quantities as low as one piece. Small quantities and prototypes are just as much a part of our daily routine as series production or large orders.

Our technologies

LaserJob utilizes advanced technologies and innovative processes to achieve maximum precision and efficiency in laser cutting stainless steel. Our method blends technical excellence with customized solutions designed specifically for your needs.

Our production

Our manufacturing conditions – precision and perfection

Climate-controlled production environment: Consistent temperatures ensure maximum precision and process reliability.
Versatile cutting areas: By expanding the cutting areas to 600 x 2000 mm and 1000 x 1000 mm, we can implement even more of your ideas. We specialize in material thicknesses from 10 µm to 3.0 mm.
In-house designed production machines: Our production machines were designed in-house to enhance the capabilities of conventional standard machines. When combined with proven laser technology from renowned manufacturers such as Trumpf and Alphalaser, we achieve powerful systems with unique production capabilities.
Versatile machines: 20 production machines enable both optimal production variants for each project and a wide range of services (laser cutting, laser welding, laser engraving, but also micro-bending and small-scale machining processes such as turning, milling, or countersinking).
In-house design and data preparation: Project-oriented and personal support from in-house experts.
Extensive material warehouse: Fast response times and high flexibility thanks to on-site warehousing and short links to renowned suppliers.
Redundant manufacturing systems: Consistent and timely delivery capacity through the use of multiple machines operating simultaneously.

With state-of-the-art technology and strict quality standards, we create solutions that meet the highest requirements—both now and in the future.

Materials

To achieve optimal welding results, we recommend the following:

Stainless steel
all Chrome-nickel steels
Nickel
Invar36
pure Aluminium (99%)
Copper
Copper alloys, like brass, bronze, and high-performance alloys, like Ampcoloy
Silver

These materials enable precise, low-distortion, and stable weld seams.

To ensure consistent high quality, it is essential to use materials from the same batch for all projects.

Metal alloys containing sulfur, lead, zinc, or high carbon content can only be welded to a limited extent. These products require individual welding tests.

Laser welding variants

Two pinhead-sized stainless steel fasteners with laser-cut covers; on the left, the cover is still leaning to one side, while on the right it is precisely and almost invisibly welded; pin with green head for size comparison.

Micro welding

Highest precision when welding delicate components

Three-armed stainless steel rotary knife with serrated blade; stable and clean thanks to a central weld seam, connected to a tube as a central holder.

Aluminum welding

Stable welded joints also for micro components made of aluminum

Repair welding and laser surface cladding

Fast and cost-effective mold and tool repair

Why choose LaserJob?

adept knowledge

To ensure reliable processes, LaserJobs support begins at the planning stage. With our professionals, the results are consistently quality: individual, precise, and of the highest standard.

sturdy and leak-proof

To meet the highest standards, our micro-welds are permanently durable and can be reliably tested for leaks based on your requirements.

no matter the quantity

Whether it's a single item or a series, we manufacture precisely for you from the very first piece—perfect for prototypes and tailor-made products.

quick delivery

Benefit from our fast delivery times—thanks to our flexible service, even urgent projects always stay on schedule.

Your ideas, our expertise

Let's get your project started!

The fastest way to reach our order colleagues is by email at mail@laserjob.de or by calling us directly during our business hours.

This enables us to process your request efficiently and promptly. Find your personal contact person here.

Please note that the parts to be worked on have to be clean and free of oil and grease. An adjustment or test sample would also be beneficial.

When it comes to material processing, it is almost impossible to give general delivery time estimates. Requirements and projects vary too greatly. Please contact us directly to discuss how quickly we can deliver to you.

We manufacture for you from a batch size of 1 – ranging from prototypes and individual items to full series production.
For maximum flexibility, we deliver your products reliably and independently of the batch size.

Wherever possible, the documents and drawings provided should contain the following information:

Weld drawing with details of the weld position
Technical drawing with the exact dimensions of the component
Information regarding the material

Ideally, you provide us with the data in step, DXF, or DWG format.

Please note that the parts to be worked on have to be clean and free of oil and grease. An adjustment or test sample would also be beneficial.

We encourage you to provide additional materials if available, so we can establish the optimal welding parameters.

Should you have any questions regarding the design or require further information, please don't hesitate to contact your personal representative directly.

We have three recognized methods

for testing the tightness of welds: water bath test, vacuum test, and pressure drop test. Each of these methods has specific advantages and areas of application.

1. Bubble Test:

Each component to be tested is sealed, pressurized, and completely submerged in a water bath.
Air bubbles escape from leaks and become visible in the water. This enables us to identify not only the presence of a leak, but also its exact location.
This method is simple, cost-effective, and particularly well suited for quickly detecting and locating leaks in weld seams. However, it is subjective, as the assessment is visual, and its overall sensitivity is limited.

2. Vacuum Test:

This test requires the use of a special vacuum leak detector.
A vacuum bell covers the weld seam, generating negative pressure that is monitored over a set period of time.
An increase in pressure in the vacuum chamber during the test period indicates a leak, as air is entering through the weld seam.
Evaluation is based on the measured pressure change, which enables an objective and reproducible assessment of leak-tightness.
Vacuum testing is particularly advantageous in situations that require high precaution or when the component cannot be fully submerged in water.

3. Pressure drop test/differential pressure method:

A predefined level of pressure is applied to the test piece, and the resulting pressure curve is monitored over time.
Any pressure drop indicates a leak. Our ForTest model is a modern device that operates with very high sensitivity, delivering fast, objective, and reproducible results.
This method is particularly well-suited for series production and automated testing processes, as it provides precise, quantifiable information about leak-tightness.

Zusammenfassung der Vorteile:

Method	Key benefit	Typical use	Sensitivity
BubbleTest	Locating the leak	Single test, visual inspection	Medium
Vacuum Test	Fast, versatile leak detection	Weld seams, large components	High
Pressure drop test	Objective, quantifiable measurement	Batch production, automation	Very high

All of the methods mentioned are non-destructive and recognized as standard methods for leak testing in compliance with DIN EN 1779. Choosing the optimal method depends on your requirements in terms of sensitivity, scope of testing, and level of automation.

Annealing colors occur during laser welding due to oxidation of the metal surface under the simultaneous influence of heat and oxygen. However, thanks to their extensive field experience, our welding experts can minimize the development of annealing colors by precisely adjusting the power and selecting the appropriate shielding gas for each application.

Depending on the project, it may not be possible to completely prevent this from happening. In that case, the surface could be finished by grinding or electropolishing.

Component design is the most important factor for low-distortion micro welding. The smaller the gap between the components to be joined, the lower the distortion during welding. A precisely fitting design minimizes leeway and allows for even force and heat transfer, significantly reducing shrinkage stresses and deformation during welding.

Naturally, our specialists will be happy to assist you right from the design stage to ensure you achieve the perfect result.

Any questions? Feel free to contact us directly— Your personal contact is looking forward to your call:

Online inquiry

Robert MassenhauserSales Laser material processing

+49 (0) 8141 52778 - 25 r.massenhauser@laserjob.de

Facing new challenges?

Let us advice you!

FAQ: Frequently asked questions

Laser welding is a modern welding process which utilises a highly focused laser beam as an energy source to fuse materials – usually metals or plastics – together with pinpoint accuracy. It is one of the joining manufacturing processes and is primarily used where high precision, narrow weld seams, and minimal thermal distortion are required.

How does laser welding work?

A laser generates a very intense, concentrated beam of light that is focused onto a tiny focal spot (typically 0.2–2.0 mm in diameter) on the component's surface using optics.
The high energy density at the focal point causes the material at this point to melt or even vaporize within fractions of a second.
Moving the laser beam along the desired seam line creates a melting zone which, after solidifying, forms the weld seam.
A protective gas, such as high-purity argon, is usually supplied to protect the seam from oxidation.
This process can usually be carried out without filler materials, but it is also possible to use filler materials, for example, in laser surface cladding.
High cooling speed ensures a sturdy weld seam.

Vorteile des Laserschweißens

Sehr präzise, schmale und saubere Schweißnähte
Geringer Wärmeeintrag und minimaler Verzug am Werkstück, was besonders bei dünnwandigen oder empfindlichen Bauteilen wichtig ist
Hohe Schweißgeschwindigkeit und Produktivität
Eignung für schwer zugängliche Stellen und komplexe Geometrien
Breites Anwendungsspektrum: von Automobilindustrie über Medizintechnik bis hin zur Raumfahrt

Typische Anwendungen

Automobil- und Maschinenbau
Feinwerktechnik, Elektronik, Sensoren
Medizin- und Dentaltechnik
Schmuckindustrie
Reparaturschweißen und Gussteil-Instandsetzung
Reparaturschweißen von Oldtimer Teilen (Zylinderkopf, Motorblock)

Arten des Laserschweißens

Tiefschweißen: Besonders hohe Intensität, bildet einen Dampfkanal („Keyhole“) für tiefe und schmale Nähte
Wärmeleitungsschweißen: Flache Einschweißung, für ästhetisch anspruchsvolle, aber weniger belastete Verbindungen
Punktschweißen: Für kleine, punktuelle Verbindungen, oft im Mikroschweißen
Nahtschweißen: Für durchgehende, lange Schweißnähte
Laserauftragsschweißen: Auftrag von Zusatzmaterial, wie Draht oder Pulver zur Reparatur oder Beschichtung

Laserschweißen nutzt die Energie eines gebündelten Laserstrahls, um Materialien präzise, schnell und mit minimalem Wärmeeintrag zu verschmelzen. Es ist besonders geeignet für Anwendungen, bei denen hohe Qualität, Geschwindigkeit und geringe Verformung gefragt sind, und wird in vielen Hightech-Branchen eingesetzt.

Adding filler material

in laser welding has a significant impact on process stability:

Filling gaps and tolerances: Material addition enables the bridging of larger gaps or manufacturing tolerances between workpieces. Without filler material, any such gaps can lead to unstable weld pools and uneven welds, which impair process stability.
Improving seam quality: Filler materials can be used specifically to reduce the development of welding defects such as pores, cracks, or spatter. This increases the reproducibility and reliability of the process.
Stabilization of the weld pool: The additional material has a positive effect on the melt pool by improving heat distribution and the flow behavior of the melt. This reduces the risk of instabilities such as melt ejection or uncontrolled melt flow.
Expanding process limits: Particularly with demanding materials such as copper, which are difficult to weld due to their high thermal conductivity and reflectivity, material addition can help achieve stable and deep weld seams, thereby extending the process limits (e.g., maximum weld depth).
Reducing seam defects: Selecting the right filler material can help prevent metallurgical problems, such as hot cracks in aluminum alloys, and make the process more stable.

In summary, adding material enhances laser welding's robustness against deviations in workpieces, materials, and process parameters, thereby boosting process stability and reproducibility, especially in challenging applications or those with high-quality standards.

The narrow heat-affected zone

in laser welding reduces material distortion through the following mechanisms:

Lower heat diffusion

The laser beam focuses the energy onto an ultrasmall focal spot (typically 0.1–0.5 mm in diameter), which limits the heat to a localized area. In comparison, conventional welding (e.g., MIG/MAG) produces a HAZ with a width of 2–10 mm.
Limited heat input minimizes thermal stresses caused by irregular expansion and contraction of the material.

Rapid cooling

Due to the laser's high energy density, the material melts briefly, leading to rapid cooling of the melt zone.
This short heat dwell time prevents the thermal effects from spreading far into the surrounding material.

Targeted control of heat input

Parameters such as laser power, focus, and welding speed can be precisely adjusted to control the HAZ in a targeted manner.
Example: Increasing the travel speed reduces the heat exposure time and further reduces the HAZ.

Vergleich zu konventionellen Verfahren

Parameter	Laser welding	MIG/MAG-welding
Width of the heat-affected zone	0,1–0,5 mm	2–10 mm
Thermal distortion	Almost immeasurable	Clearly visible

Use cases

When using thin sheets (0.1 mm or less), dimensional accuracy is maintained as deformations such as warping or shrinkage are avoided.
Even with heat-sensitive materials such as aluminum or copper, there are no coarse structural changes in the HAZ that could lead to brittle fractures.

In summary, the narrow HAZ ensures minimal material distortion thanks to limited heat spread, rapid cooling, and precise control—a decisive advantage for precise manufacturing processes.

Explore more LaserJob services

Oil sensor with clean, stable laser weld seam on the welded upper attachment thanks to precise laser micro-welding.

Laser welding

Strong joints with precision:

LaserJob performs laser and micro welding for stainless steel, aluminum, and more—with low distortion, lasting durability, and precision according to specifications.

[Translate to Englisch:] Ein runder schwarzer Schalterring, laserbeschriftet in sehr sauberem Farbabtrag in Weiß mit den Worten "Sport, Pfeilsymbolen und Green"

Laser marking

Permanent and detailed markings:

LaserJob offers laser marking on metals, technical plastics, glass, and wood—razor sharp, durable, and abrasion-resistant, even for complex geometries.

Stainless steel belts

Precision by the meter—stainless steel strips that set standards

We manufacture stainless steel belts precisely made to measure – with a deviation of only 7 µm over a length of 2000 mm. Ideal for encoder, transport, and conveyor belts in industry and technology.

Repair welding and laser surface cladding

Repair instead of replacing:

Our experts repair and optimize tools and components through build-up welding, ensuring durability, precision, and material-friendly characteristics efficiently and affordably.