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What temperature should wave soldering use?

Wave soldering temperature has no single universal value. The solder alloy needs a suitable bath temperature, the flux needs the right preparation, the joints need sufficient heat for wetting, and components and board materials must stay within their permitted exposure. These are related requirements, but they are not the same temperature or measurement location.

As a documented example, Kester's K100LD comparison sheet lists a suggested pot range of 255鈥�270掳C for K100LD and 250鈥�260掳C for SAC305. It lists melting behavior separately: approximately 227掳C for K100LD and 217鈥�220掳C for SAC305. These are alloy-supplier examples, not a production recipe for every PCB. Verify the current material instructions, actual process and component limits before use. See the .

A useful process review starts with a measured board profile and clearly located sensors. Turning the pot hotter because a joint has poor hole fill can hide problems with flux, preheat, solderability, copper connections or contact. Diagnose the mechanism, then confirm any process change on the actual assembly.

Keep four different thermal quantities separate

The difference matters when a board contains large connectors, copper planes or sensitive plastic parts. A bath can be stable while individual regions heat differently. A top-side sensor, bottom-side sensor and device-body sensor may show different curves. Record each location rather than labelling all channels simply 鈥淧CB temperature.鈥�

Use the through-hole assembly process for the full route. This page concentrates on thermal interpretation, contact geometry and troubleshooting. Where only isolated joints should contact solder, the selective soldering review addresses local nozzle access and the associated thermal questions.

Prepare the flux and board without borrowing a generic recipe

Preheat affects solvent removal, flux activation, thermal gradients and the temperature at which the board reaches solder contact. The appropriate conditions depend on the flux chemistry, deposition, assembly thermal mass and equipment. A value taken from another product's data sheet can be inappropriate even when both materials are described as no-clean or water-based.

Begin with the selected flux supplier's instructions, then measure the relevant assembly locations. discusses flux-specific processing questions. Use it as background, and obtain the current data sheet for the exact product and application method. Machine heater settings should remain distinguishable from the temperatures measured on the board.

Watch for large local differences. A light region may heat rapidly while a copper-connected terminal remains comparatively cool. The objective is not simply to maximize preheat. It is to establish a repeatable process that prepares the joint and flux while respecting component, laminate, connector and fixture restrictions.

Changing panel size, conveyor loading or pallet construction can change the heating behavior. Repeat the relevant profiling work after a meaningful change rather than assuming that a saved setpoint guarantees the previous result. Record which configuration was measured so that the profile can be matched to the production traveler.

Distinguish wave contact from time above a threshold

Contact time describes how long the relevant region interacts with molten solder. Threshold duration describes how long a particular sensor is above a selected temperature. The quantities can correlate, but they are not interchangeable. A sensor may remain hot after leaving the wave, and its response can lag the local joint condition.

For the geometric estimate, measure the footprint along travel. Do not use the transverse width of the machine or the full tank dimension. If there are two waves, record their individual contact regions and separation. Simply combining all distances into one continuous exposure can obscure the cooling or transition between contacts.

Conveyor angle, board immersion, wave height and fixtures can affect the actual contact. Measurements should reflect the working configuration, not an empty-machine assumption. Where a process window is narrow, use a suitable contact measurement method and repeatability checks. The worksheet is a planning aid for understanding the quantities before that verification.

Make the profile record reproducible

Choose sensor locations to answer specific questions: a high-mass connector joint, a thermally restricted component, a representative low-mass area and other identified risks. The exact selection belongs to the assembly review. A convenient central point does not automatically represent the hottest package or the most difficult joint.

Thermocouple attachment matters. An attachment method can alter response or fail during processing, and a detached sensor can produce a plausible-looking but misleading trace. Document the location, attachment and channel identity. Inspect the setup before and after the run, and retain enough detail for another engineer to reproduce the measurement.

The largest recorded sample is a sampled peak, not proof of the true instantaneous maximum. Similarly, a rate calculated between two samples is an average over that interval. The tool makes these limits explicit. Use the profiler's suitable acquisition settings and the equipment manufacturer's measurement instructions when a component limit depends on a short event.

Retain alloy and flux identity, machine and program revision, panel orientation, fixture, conveyor speed, bath verification and loading conditions with the trace. A profile screenshot without this context is difficult to compare after a process change. Record the approved operating window separately from the single run used to support it.

Investigate the symptom before changing temperature

These are investigation prompts, not one-to-one diagnoses. Several mechanisms can produce similar symptoms. Change one controlled factor at a time where practical, retain the result and avoid increasing thermal stress merely to compensate for an inaccessible or poorly prepared joint. Escalate material or design conflicts rather than forcing them into a machine adjustment.

For high-copper boards, review the local connection to internal planes and the current requirement before changing thermal reliefs. For dense mixed assemblies, review whether the broad wave is the appropriate route. A design change, a selective operation or a different fixture may be more effective than pursuing a hotter nominal pot setting.

Use standards to define evidence and workmanship

The production agreement should identify the applicable IPC documents, revisions, class and project-specific criteria. The provides the document starting point. J-STD-001 process requirements and IPC-A-610 assembly acceptance serve related but distinct purposes; neither should be reduced to a single universal wave temperature.

Confirm the required joint views and inspection coverage, particularly where components or fixtures restrict observation. Electrical testing can reveal some failures but does not replace workmanship assessment. Agree how nonconforming findings, repairs and changed settings are recorded. Retain traceability between the inspected assembly revision and the process evidence used to release it.

If a product must meet a reliability requirement, define the applicable qualification or validation work separately. A profile within the entered limits is evidence about that measured process, not proof of all service-life conditions. The test plan should answer the actual environmental, mechanical and electrical risks of the product.

Budget the profiling and verification scope

Thermal development costs depend on the number of configurations, difficult joints, tooling, instrumentation and requested records. A simple recurring board with an established route differs from a first build containing unusual connectors or heavy copper. Ask the quotation to distinguish initial setup and development from recurring assembly and inspection.

Provide the exact alloy and flux restrictions if they are fixed. Include acceptable quantities, prototype and production stages, panel information, component limitations and the records required with delivery. An apparent price difference may reflect different assumptions about profiling, fixtures or inspection rather than a different price for the same service.

Use the assembly cost scope guide to organize these items. This page does not generate a universal wave-soldering price from temperature or joint count. Send the trace and open engineering questions directly for review; the worksheet is optional and does not transmit project information automatically.

Wave soldering temperature questions