Question:
What are the preheating and soldering temperature conditions for automatic soldering on PCBs?
Answer
The conditions are different for through-hole flow and surface-mount reflow. Refer to Explanation for details.
Explanation
Through-hole mounting type
1-1 Preheating process
Preheating: 110°C max. / Duration: Within 40 seconds
- Caution
- Be sure to preheat to improve the solderability.
- Preheat under the above conditions.
- Do not use a relay that has been left in high temperature for a long time due to equipment failure which may cause a change in initial characteristics.
- Availability of preheating
- Closed type: Not applicable
- Flux-resistant type: Applicable
- Plastic-sealed type: Applicable
1-2 Soldering
Solder temperature: ca. 260°C / Soldering time: Within about 5 seconds
- Caution
- The flow solder type is recommended for uniformity of quality.
- Adjust the fluid level so that the solder does not overflow on the PCB.
- Availability of automatic soldering
- Closed type: Not applicable
- Flux-resistant type: Applicable
- Plastic-sealed type: Applicable
Surface-mount type
Examples of recommended soldering conditions for the IRS (infrared reflow soldering) are shown in the following temperature profile (PCB surface).
- Recommended soldering conditions may differ for each relay. Please check individual specifications before use (refer to the Precautions for each model).
- Do not soak the product in cold liquid such as cleaning solution immediately after soldering. Doing so may damage the seal.
- Do not soak the relay in the solder bath. Doing so may cause malfunction due to resin deformation.
[Solder for mounting: Lead-free solder]
[Solder for mounting: Lead solder]
For more information, see Safty Precautions for All Relays: 6-10 Automatic Mounting of Relays for PCBs.
Quick tips
- After automatic soldering, immediately blow air to cool the relay and other components so that they do not deteriorate due to the heat of soldering.
- You may clean the plastic-sealed type but do not soak it in cold liquid such as cleaning solution immediately after soldering.
Doing so may damage the seal.
Precautions: Cooling is required for flux-resistant and plastic-sealed relays.
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