Lines
Reflow Oven
Reflow Oven is where paste volume, pad design and component mass meet the temperature profile. On South African SMT lines, this stage often decides whether joints come out bright and stable or show voiding, tombstoning and disturbed wetting after inspection.
Profile windows across oven zones
Reflow Oven covers the section of the SMT line where profile decisions turn into solder joints. It is aimed at teams checking heat transfer, board mass and the oven conditions that separate a clean run from repeat faults.
Set the profile around the actual board build, not the drawing alone. Heavy copper, large ground planes, aluminium-backed boards and dense BGA areas all absorb heat differently, so conveyor speed, soak time and peak temperature must be checked against the paste data sheet. Inland winter mornings and humid coastal conditions can also change how assemblies enter the oven after printing and placement.
Before the first production run, verify thermocouple placement on the coldest and hottest parts of the assembly. A recorded profile with date, paste type and board code gives the line a usable reference when joints shift after maintenance, a recipe change or an unscheduled stop.
Checks before first heated board
Confirm zone setpoints, chain or mesh condition, exhaust extraction and nitrogen status where fitted. Also inspect whether flux residue is building up near the entrance, because contamination around the rails and fingers can affect board travel and leave marks that get blamed on printing or placement.
Use the matching reflow note, then send the key profile details through the contact form when you need input on a specific assembly. Include paste alloy, board size, component mix and any defect pattern seen after the oven, such as head-in-pillow, insufficient fillet or skewed chip parts.
- Peak temperature matched to paste alloy
- Soak time checked on heavy boards
- Defect notes tied to oven settings
Coastal moisture and inland dust
Sites near Durban and Cape Town often need closer attention to moisture control on stored boards and components before reflow. Around Johannesburg and Pretoria, dust build-up can shorten cleaning intervals on fans, sensors and cooling sections, which then affects repeatability from one batch to the next.
Power interruptions matter at this stage because an oven that cools unexpectedly can leave half-processed assemblies and uncertain joint quality. Where backup power is limited, teams should define what happens to boards stopped in each zone, how restart profiles are verified, and when a fresh first-off inspection is required.
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Defects linked to thermal behaviour
When briefing a reflow issue, note the exact defect, where it appears on the board and whether it follows one product family or several. Photos from AOI or microscope inspection help most when paired with the recipe name, zone temperatures, conveyor speed and the time gap between printing and reflow.
Keep the oven record with the project file for each assembly revision. That makes it easier to compare one profile against another when a component substitute, stencil change or different laminate shifts the thermal response of the line.
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