science

Laser guided and stabilized arc welding

Laser guided and stabilized arc welding is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Laser guided and stabilized arc welding rather than just read about it. In short: Laser guided and stabilized welding (LGS-welding) is a process in which a laser beam irradiates an electrical heated plasma arc to set a path of increased conductivity. Therefore, the arc's energy can be spatial directed and the plasma burns more stable.

Key takeaways

Laser guided and stabilized arc welding belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Laser guided and stabilized arc welding to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Laser guided and stabilized arc welding from memory before moving on to harder problems.

Reference excerpt

Laser guided and stabilized welding (LGS-welding) is a process in which a laser beam irradiates an electrical heated plasma arc to set a path of increased conductivity. Therefore, the arc's energy can be spatial directed and the plasma burns more stable. The process must be distinguished from laser-hybrid welding, since only low power laser energy of a couple hundred Watts is used and the laser does not contribute significantly to the welding process in terms of energy input.

Operation The principle of laser enhanced welding is based on the interaction between the electrical arc and laser radiation. Due to the optogalvanic effect (OGE) a channel of higher conductivity in the plasma is established along the path of the laser. Therefore, a movement of the laser beam results in a movement of the electrical arc. This effect is limited to a range of some millimeters, but shows the influence of the radiation to the plasma. A raise of welding speed of over 100% is described by using a diode laser with a wavelength of 811 nm without a significant loss in penetration depth. Furthermore, this technique is used in cladding. Depending on the welded material argon or argon with CO2 is used as shielding gas. The laser source must be tuned to emit at a wavelength of 811 nm and is focused into the plasma.

Laser guided and stabilized GMA-Welding The process is used for welding thin metal sheets up to about 2 mm when welding in overlap or butt joint. LGS-GMA-welding is most advantageous when welding fillet welds. The guidance effect of the laser radiation forces the arc into the fillet. Therefore, a steady seam can be reached. Furthermore, the stabilization of the plasma enables the GMA-process to weld thin sheets without burning holes in the material.

Equipment and setup The setup requires the GMA welding head tilted at 60° to the work piece surface. In order to realize a maximum overlap between the electric arc and the laser beam in the process area, the laser is installed upright to the workpiece and focused in the electrical arc. Standard welding equipment can be used for the process. The laser source is described above.

Laser guided and stabilized double head TIG-welding In laser guided and stabilized double head TIG-welding the laser forces two arcs together. The goal of this technique is to increase the welding speed of TIG-welding without compromising the quality.

Equipment and setup For this process two TIG-sources are needed and the laser described above. The TIG-torches are set up with the laser beam perpendicular in the middle. All welding modes of the two torches are possible (DC/DC, AC/AC, AC/DC).

Laser guided and stabiliszed GMA-Cladding In LGS-GMA-cladding the stabilization effect is used enable the GMA-process to work with low energy. This is needed to reduce the penetration depth and therefore the dilution of base and deposition material. The combination of GMA-welding and a diode laser lead to a more cost effective and energy efficient process.

Equipment and setup The setup for the LGS-GMA-cladding is almost alike the one for LGS-GMA-welding beside that the GMA-source needs to have a "Cold-MIG" process. This means, that the welding current is controlled my microcontrollers and produced by power electronics. That way not only the current peaks can be controlled, but also the slopes.

References

External links and further reading Project homepage at LZH (german) Archived 2011-07-19 at the Wayback Machine Project Homepage (Laser Stabilized Double TIG-welding)[link removed] Wendelstorf, J.; Decker, I.; Wohlfahrt, H. 1994, Laser-enhanced gas tungsten arc welding (Laser-TIG), Welding in the World Cui, H., 1991, Untersuchungen der Wechselwirkung zwischen Schweißlichtbogen und fokussiertem Laserstrahl und der Anwendungsmöglichkeit kombinierter Laser-Lichtbogentechnik, ISSN 0344-9629. (German only) Paulini, J., Simon, G., 1993, A theoretical lower limit for laser power in laser-enhanced arc welding, J. Phys. D: Appl. Phys. 26 (1993) 1523-1527 M. Schnick, S. Rose, U. Füssel, A. Mahrle, C. Demuth, E. Beyer: Numerische und experimentelle Untersuchungen zur Wechselwirkung zwischen einem Plasmalichtbogen und einem Laserstrahl geringer Leistung: DVS (German only) Cui, H., 1991, Untersuchungen der Wechselwirkung zwischen Schweißlichtbogen und fokussiertem Laserstrahl und der Anwendungsmöglichkeit kombinierter Laser-Lichtbogentechnik, ISSN 0344-9629. (German only)

Worked examples

Example 1 — a first encounter with Laser guided and stabilized arc welding

Start with the simplest possible case. Write down what Laser guided and stabilized arc welding claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Laser guided and stabilized arc welding before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Laser guided and stabilized arc welding ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Laser guided and stabilized arc welding

In research: Laser guided and stabilized arc welding appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Laser guided and stabilized arc welding in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Laser guided and stabilized arc welding is common in secondary-school and first-year university syllabi. It links to neighbouring topics Welding, so understanding it makes those chapters shorter.
In everyday life: Look for Laser guided and stabilized arc welding outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Laser guided and stabilized arc welding in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Laser guided and stabilized arc welding means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Laser guided and stabilized arc welding out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Laser guided and stabilized arc welding in simple terms?

Why does Laser guided and stabilized arc welding matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Laser guided and stabilized arc welding?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Laser guided and stabilized arc welding.