Electronics production: soldering and test on trial and margin

Board temperature profile found by trial

What happens. The reflow oven profile for a new board is found by running test boards with thermocouples attached and adjusting until the readings look right. Every new layout, copper area or heavy component repeats the exercise. Between trials, nobody knows what the board actually does.

What it costs. Cold joints, tombstoned parts and thermal stress on sensitive components show up as defects at inspection or, worse, in the field. Engineers spend hours on profile trials and the line stands still while they do.

Why the usual fix fails. A profile that works for one board is copied to the next and left alone. Measuring every board is not possible, and a profile with generous margin heats the delicate parts for longer than they like.

How a fixed-price remote diagnosis checks it. From oven logs, zone setpoints, conveyor speed and the profiles you already trust, I compute how the temperature of a board develops through the oven. The fixed-price remote diagnosis shows whether a computed board temperature can replace most trial runs and where it would still need a measurement.

The wave and selective soldering window drifts

What happens. Settings that gave good joints last month give bridges, voids or dry joints this month. Flux, solder bath contamination, nozzle wear and board mix all move the window, and operators correct by feel.

What it costs. The result is rework, extra inspection and the occasional batch held back. Correcting after the defect appears means the boards in between are already made.

Why the usual fix fails. Re-qualifying the process on a fixed schedule costs line time and still misses the drift between two checks. A new sensor at one point shows that point, not the quality of the joints.

How a fixed-price remote diagnosis checks it. I look at your machine logs (preheat temperatures, conveyor speed, solder temperature, flux flow) against inspection results. The fixed-price remote diagnosis tells you whether the drift can be estimated from signals you already record, and whether the settings could be corrected before defects show.

The glue amount varies with viscosity

What happens. Adhesive, underfill or thermal paste is dispensed with fixed pressure and time. When the material warms up, ages in the cartridge or the room temperature changes, the same settings put down a different amount.

What it costs. Too little means weak bonds and poor heat transfer. Too much means contamination, cleaning and rejects. Both are found at inspection or later.

Why the usual fix fails. Operators adjust pressure by hand when a pattern looks wrong, and the correction lags behind the change. Warming the material helps with temperature but not with ageing.

How a fixed-price remote diagnosis checks it. From dispenser settings, material and room temperatures, cartridge age and your inspection records, I check how much of the variation can be explained and corrected in advance. The fixed-price remote diagnosis shows whether a computed correction of pressure or time is realistic for your dispenser.

End-of-line tests take too long

What happens. Every board runs through a full functional test, whether it is the first of the day or the thousandth identical one. The test station sets the pace of the line, and a second station means more floor space and more fixtures.

What it costs. Slow tests cap throughput and tie up test equipment and staff. Shortening the test by hand risks letting a rare fault escape.

Why the usual fix fails. Dropping test steps because they never failed is a gamble nobody wants to sign. Buying more test stations only moves the cost.

How a fixed-price remote diagnosis checks it. I look at your test results and process data to see which steps carry information and which repeat what earlier stations already showed. The fixed-price remote diagnosis answers whether the test can be shortened for boards with a clean history, and what evidence you would need before doing it.

Sintering and bonding windows are narrow

What happens. Silver sintering, diffusion soldering and bonding of power modules need pressure, temperature and time inside a narrow window. The result cannot be seen from outside; a poor joint looks like a good one until it fails.

What it costs. Weak joints show up as early field failures, or as scrap after destructive sampling. Safety margins on process time cost throughput on an expensive press or oven.

Why the usual fix fails. Sampling and cross-sections check a few parts after the fact. Tightening the process limits makes every deviation an alarm and slows the line.

How a fixed-price remote diagnosis checks it. From press and oven logs, material batches and the test results you have, I check how well the joint quality can be estimated during the process. The fixed-price remote diagnosis tells you whether an in-process value could release parts without as many destructive checks.

Teams cannot find control engineers for fast positioning axes

What happens. Test and handling equipment for electronics needs axes that move fast and settle quickly. The control of these axes is often written by one or two people, and when one leaves, the know-how goes with them.

What it costs. Roles for this skill stay open for months. Meanwhile a machine generation ships with controllers tuned conservatively, and the speed the mechanics could deliver stays unused.

Why the usual fix fails. Hiring a generalist software engineer does not close the gap, and a bigger drive does not help if the motion profile and the controller are the limit.

How a fixed-price remote diagnosis checks it. I can look at your axis logs (commanded and measured position, current, vibration after the move) as an outside check. The fixed-price remote diagnosis shows how much faster the axes could move with a better motion profile and controller, and what a fix would involve.

Background: Predictive control for precise machine motion