Castings, extrusions, anodized housings, machined plates, nameplates. Each one takes a mark differently. An aluminum marking machine that gives a sharp code on an anodized cover can barely touch a rough casting.
Pick by surface, not by metal. That is the shortest route to permanent marking on industrial aluminum. HeatSign builds four marking systems for this job: two fiber lasers and two electric dot peen units.
Reply within one working day. Free marking test. No sample shipping needed.
One rule explains most of this table. A laser mark on aluminum comes out white or grey. Black appears in one case only: a MOPA source working on an anodized oxide film. Find your surface on the left, then read the last column. A coating step after marking can undo everything.
The black is not in the metal. It lives in the oxide film on top. A MOPA source holds a very short pulse, so heat stays inside that film. The film darkens and stays sealed. Anodized aluminum laser engraving is the only route on this page to a genuine black.
A plain fiber source uses a longer pulse. It burns through and exposes bare metal, giving a white mark and losing the corrosion barrier. That is the usual failure in laser marking anodized aluminum.
One honest limit. For bright color rather than black, a UV source suits some dyed films better than ours. We say so when your samples point that way.
Two HeatSign systems write with light. Two press with a hard pin. That split decides more orders than any specification sheet.
HS-PFL Series Portable Fiber Laser Marking Machine
30W / 50W handheld fiber laser
HS-FL30M MOPA Fiber Laser Engraver
HS-DE Series Desktop Electric Dot Peen Marking Machine
HS-PE Series Portable Electric Dot Peen Marking Machine
Photos show you the mark. Video shows you the cycle time. On the left, a HeatSign fiber laser writes a full qr code in seconds. On the right, a dot peen pin drives the some contents into the aluminum plates. One dot at a time.
You can put the laser head on your part. A qr code lands in seconds and the surface stays flat. Best for tags, housings and anything thin.
A tungsten pin strikes the surface again and again. Slower and louder, but you can feel the result, which is deep and permanent. Best when a coating comes next.
Every HeatSign machine is judged by the code it leaves behind. That code has to survive heat, oil and a coating line. Years later it must still can read. That is what permanent aluminum marking has to deliver.
The core of most orders. Serial number engraving on aluminum ties one part to one record for life.
Square codes that hold a lot in little space. Data matrix engraving on aluminum still scans with a damaged corner.
Cheap to scan and easy to print. Barcode engraving on aluminum suits flat plates and long tags.
Any phone reads them, so no scanner is needed. QR code marking on aluminum fits service and warranty work.
Fine artwork needs a laser. Pins cannot hold a curve tight enough for small brand detail.
These go deep because paint comes later. Dot peen is the only safe choice here.
Thin extrusions bend easily. Aluminum marking for aerospace industry parts usually goes to a laser, because nothing presses on the part.
Blocks and housings meet paint after assembly. Aluminum marking for automotive industry lines is where HeatSign portable dot peen units earn their place.
Laptop shells and power banks stay in plain sight. The mark has to look designed, so MOPA runs this work.
Instruments face cleaning again and again. A laser mark sits flush with the surface, so nothing collects inside it.
Plates travel between shops all year. Only a deep code stays legible through that much handling.
Billets are hot, rough and heavy. Operators walk the machine to the rack instead of moving the metal.
Four questions buyers ask before they choose. We also say when the other tool is the better buy.
No. On an untreated surface the result is white to light grey. The beam roughens the metal rather than colouring it. It reads clearly and it lasts. Any supplier promising jet black on raw stock is stretching the truth.
Black needs an oxide film plus a MOPA source. Without that film there is nothing to darken. That surprises most people who start fiber laser engraving aluminum for the first time.
Only the pressed one. Paint fills a laser mark and hides it completely. We have watched customers lose a whole batch this way.
A dent keeps its shape because the surface itself moved. This is the clearest case where dot peen beats every laser we sell.
Below roughly 1 mm it can dimple the back face. The pin has to strike hard, and thin stock gives way under it.
A laser touches nothing, so the sheet stays flat. On thin work our dot peen range is the wrong answer, and we say so before you order.
The laser, by a wide margin. It writes a full code in seconds. A pin places one dot at a time, so a data matrix takes several seconds more.
If your takt time is tight and no coating follows, laser marking wins. If depth is the requirement, accept the slower cycle.
Small desktop units are fine machines for what they do. On anodized tags and coated blanks they give clean results cheaply.
Bare metal is the first limit. Aluminum reflects most light from a diode or CO2 source, so those machines need a spray coating before every job. A fiber source at 1064 nm marks bare aluminum directly, with no spray at all.
Running hours are the second limit. A hobby machine is designed for occasional use. HeatSign builds for three shifts a day, six years out.
Seven answers you will not find above. All of them come up in real quotations.
Mark last, if your process allows it. A cutter will shave the code off a machined face. A bend will stretch the characters until scanners stop reading them.
Sometimes the mark has to go on first. Then keep it off any face that will be cut. Keep it 15 mm away from any bend. And turn the code so its rows run along the bend line, not across it.
If the part gets formed after marking, use dot peen. The dots move with the metal. A laser mark just stretches and breaks up.
A single pass removes very little, roughly 0.01 to 0.02 mm. Reaching 0.1 mm means repeating the same path many times. It takes at least one minute.
If your drawing calls for 0.1 mm or deeper, dot peen gets there in one pass and costs far less. Deep laser work only makes sense when the surface has to stay smooth, as with mould cavities.
A pressed mark will. It is a shape in the metal, not a colour, so heat cannot fade it. Foundries count on this when they mark billets before the furnace.
A laser mark is less certain. It holds up to about 200 °C. Above that, coloured anodised parts fade first and the mark disappears. Bare aluminum lasts longer, but the surface slowly darkens again and the contrast drops.
So: hotter than 200 °C, use dot peen from the start.
Not with a HeatSign fiber laser. Marking spray exists so CO2 and diode units can grip bare metal, because those wavelengths bounce off aluminum. A 1064 nm source is absorbed directly.
Skipping the spray removes a consumable, a drying wait and a cleaning step. Over a year of production that saving usually beats the price gap between machine classes.
Yes, more than most buyers expect. High-silicon casting alloys give a duller laser mark than 6061 or 5052 sheet. Contrast even shifts between batches of one nominal grade.
In practice 6061, 5052 and 6063 mark cleanly and repeatably. High-silicon die-casting grades such as A380 and ADC12 come out dullest, and 7075 sits between the two. Dot peen barely cares. It displaces metal instead of colouring it, so readability stays stable across every grade above.
No. Set a prefix, a start number and a step size. The machine counts up on its own, part after part. Date and shift codes update themselves. Data Matrix and QR codes are built from that same data.
For a batch that is already planned, import a txt or Excel list instead. The machine works down the rows, one part per row. Both the touchscreen and the PC software do this, so a HeatSign unit runs on the shop floor with no computer attached.
Usually yes on anodized and machined surfaces, where contrast is even. Rough castings are harder, because the surface texture itself adds noise that graders punish.
Cell size is the lever most people miss. On a smooth surface a 0.25 mm cell reads reliably. On a rough casting, go to 0.4 mm or larger. Below that the texture drags the grade down whatever machine you use. Grading follows ISO/IEC 29158, and lighting at the reader matters as much as the mark itself.
