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Lesson 4.10DeformChapter 4 · Sheet and tube forming

Laser peen forming

Laser shots stretch one face so a plate curves

Laser peen forming bends metal plates without any die, using thousands of tiny laser-driven shock waves. Each shot squeezes a small patch of one surface; together they stretch that face, and the plate slowly curves, like a page that curls when one side gets damp. It shapes thick aircraft wing panels and straightens distorted parts with great control.

Thousands of laser shots stretch one face of a plate, and it slowly curves with no dieLeft: close-up cross-section of one shot. Right: the whole plate after a pattern of shots.One laser shot, close upmetal plateflowing water layer1laser head2pulse of about 20 ns(billionths of a second)plasma burst3shock wave4compressed layer, about 1–2 mmAfter thousands of shotsdashed: the flat plate beforerows of shots on this face:that face stretches, the plate bows5plate (workpiece)laser head, nozzlelaser, plasma, shotswater
laser peen forming · one shot close up, and the plate after many shotsCircled numbers match the steps below. The left view zooms in on one shot; the right view shows the whole plate.

How it works

  1. Cover the surface with water. The plate is fixed under the laser, and a thin layer of water flows over the area to be treated.

  2. Fire a laser pulse. A high-energy pulsed laser fires a very short pulse, about 20 nanoseconds long, through the water onto a spot a few millimeters wide.

  3. Make a plasma burst. The pulse turns a thin skin of the surface into plasma (a glowing, electrically charged gas). The water traps it, so pressure spikes and drives a shock wave into the metal.

  4. Leave a compressed layer. The shock squeezes the metal under the spot, leaving a layer, often 1–2 mm deep, with compressive residual stress (stress locked inside the metal that pushes outward on its neighbors).

  5. Repeat in a pattern. A robot moves the laser spot by spot along a computed pattern. The locked-in stresses add up and the plate curves; it is measured and corrected with more shots.

Key facts

Materials
Aluminum alloys (including aluminum-lithium), titanium, steels, nickel alloys
Typical parts
Gently or doubly curved wing and fuselage panels, stiffened panels, distorted parts that need straightening
Part size
From small parts to panels several meters long, limited by the robot's reach
Precision
Curvature builds up in small, controlled steps; final shape is measured and corrected, typically to within a few tenths of a millimeter
Surface finish
Slightly dimpled pattern of overlapping spots; often improves fatigue life (resistance to cracking under repeated loads)
Batch size it suits
Small series of large, high-value parts, plus repair and straightening
Tooling and machine cost
No dies; laser cells cost millions of dollars, so the work is often bought as a service
Speed
A few shots per second; a large panel can take hours

Strengths and limits

Strengths

  • No die: the shape is a program, easy to change
  • Works on thick, stiff plates and integrally stiffened panels
  • Leaves a protective compressed layer that resists fatigue cracks
  • Can straighten distorted parts precisely

Limits

  • Very expensive laser equipment
  • Only gentle curvatures, not deep shapes
  • Slow for large areas
  • Needs careful modeling and measuring to hit the shape

Where it's used

  • AircraftWing skin panels with gentle compound curves
  • SpaceCurved panels for launch vehicles and tanks
  • ShipbuildingForming and straightening large plates
  • Repair and finishingStraightening parts distorted by welding or machining

How to recognize it

  • A faint, regular grid of overlapping square or round spots on one face.
  • Gently curved thick panels with no die or press marks.
  • Often a matte, slightly dimpled patch on an otherwise machined surface.

Compare with

Shot peening12.3the same compressive-stress idea, but with a stream of tiny balls; shot peen forming bends panels the same way.Incremental sheet forming4.6also die-less and computer-driven, but a tool physically pushes thin sheet into deep shapes.Sheet metal bending4.1sharp, simple bends in a press, instead of gentle curves built from thousands of shots.

Watch it

Curtiss-Wright Surface Technologies · An animation of one shot: water overlay, plasma, shock wave and residual stress

LSP Technologies · What the process is and which parts it makes

LSP Technologies · A plate curving live as the laser works across it

LSP Technologies · The same tool used to straighten a distorted part

See real photos

Remember

  • Each laser shot locks a compressive stress into a small patch of one face.
  • Thousands of shots in a pattern make the plate curve, with no die at all.
  • Best for gentle curves on thick, valuable aerospace panels and for straightening.

More in Sheet and tube forming

All 100 processes
4.1Sheet metal bendingA press brake folds sheet along straight linesOpen the lesson4.2ShortStamping and deep drawingMatched dies cut and press sheet into shape, often in a secondOpen the lesson4.3Metal spinningA roller presses a spinning disc over a formOpen the lesson4.4Flow formingRollers stretch a spinning tube thinner and longer over a mandrelOpen the lesson4.5HydroformingFluid pressure pushes tube or sheet into a dieOpen the lesson4.6Incremental sheet formingA round tool traces contours into clamped sheet, with no dieOpen the lesson4.7Superplastic formingHot gas blows a superplastic sheet into one dieOpen the lesson4.8Electromagnetic formingA magnetic pulse throws metal onto a fitting, without contactOpen the lesson4.9Explosive formingAn underwater blast pushes sheet into one dieOpen the lesson

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