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Alloy Conversion Lead-free, Tin-Lead and Custom Solder Alloys

BEST alloy conversion via the robotic hot solder dipping process is accomplished with a multitude of different conversion options available including the conversion to tin/lead, lead free and other alloys.

If you need to change the finish on a required component, when that component is not available, off the shelf, with the correct or specified finish, tinning services from BEST can make this alloy conversion. As an example, when building a high reliability printed circuit board assembly which must be assembled using traditional lead-bearing Sn63Pb37 alloy, tinning is a solution in changing out the plating on the components. If the components that you need to use in that assembly are only available in a RoHS-compatible finish, in this case, electroplated tin, the alloy needs to be “changed out”. The answer is to “wash” the RoHS finish in a “scavenging” solder pot and apply the Pb finish in the second solder pot. After this tinning operation, the alloy, which can be confirmed by XRF analysis, can be verified as being a tin-lead surface finish.

Conversely, in order to replace a Pb finishes with a RoHS-compliant Pb-free finish the controlled robotic tinning operation can provide a solution. This operation, although similar to the previously-described version, requires special solder pots filled with RoHS alloy and constructed from titanium (this is the only proven non-contaminating material that is immune to the aggressive molten Sn). Post tinning the RoHS compliant solder coating will be on the component leads.

hot solder dipThis lead tinning alloy conversion process through robotic tinning can be summarized in the following process steps:

The procedure for lead tinning through-hole components, from start to finish, involves the following steps:

  • Test the solderability using a wetting balance tester to determine the flux type which will be required for the alloy conversion process;
  • Carefully handle and make sure that the correct fixtures for the components exists or are to be  made if the part component body style is being tinned for the first time on the given piece of robotic tinning machinery;
  • Process the components using the correct solder alloys and fluxes using   a robotic lead tinning system to control the outcome;
  • Apply the proper flux volume at the specified temperatures  
  • Preheat  the components in order to activate the flux and raise the component body temperature to reduce thermal shock;
  • Run through the solder dipping process using a double dip process.
  • First dip the components in a cleansing bath of molten alloy to remove the original coating, followed with a flux dip then a final immersion into a clean solder bath for a pure eutectic or RoHS or other alloy finish;
  • Clean the components if necessary;
  • Inspect components per the acceptance standards agreed to ;
  • Perform the final wetting balance test to ensure the solderability;
  • Report and document the details of the process.

These process steps will help to insure a capable lead tinning alloy conversion process.

 

 

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Testimonials

  • You Guys Freaking Rock with turnaround time.
    Thank you all SOOOOO much!!

    You Guys Freaking Rock with turnaround time.
    Thank you all SOOOOO much!!

    Welch Allyn

  • BEST is excellent in meeting delivery dates and are very good with clear communication of shipments, quantities, issues, etc. Their quality and technical assistance has been superb.

    BEST is excellent in meeting delivery dates and are very good with clear communication of shipments, quantities, issues, etc. Their quality and technical assistance has been superb.

    RW Technologies

  • BEST has solid high quality service every time, and at the right price. They are very dependable. I am able to start a project in less then 24 hours with no hassles. The teams always work to meet the... View More..

    BEST has solid high quality service every time, and at the right price. They are very dependable. I am able to start a project in less then 24 hours with no hassles. The teams always work to meet the demands placed on them by the customer, and are very honest about what they can do and when they can do it. They offer great value to the customer; they are willing to go the extra mile to make the customer happy.

    Motorola

  • Best has always come through when we needed them. We started using them for board repairs, now they assemble all of our boards. BEST is always responsive to our needs. On many occasions, we needed... View More..

    Best has always come through when we needed them. We started using them for board repairs, now they assemble all of our boards. BEST is always responsive to our needs. On many occasions, we needed boards repaired immediately. They have always come through for us.

    Lovejoy Controls Corporation

  • Your company name exemplifies exactly what you are, the BEST!!!

    Your company name exemplifies exactly what you are, the BEST!!!

    Alpha Circuits

  • You guys are really soldering geeks. Keep inventing those cool products.

    You guys are really soldering geeks. Keep inventing those cool products.

    Analog Devices

  • …always are very friendly and try to accommodate my short lead times

    …always are very friendly and try to accommodate my short lead times

    Qualcomm

  • There was not doubt that Francisco know the material, how to present it, and how to make the class participants feel at ease..all of my guys came to me and how me how much they had learned.

    There was not doubt that Francisco know the material, how to present it, and how to make the class participants feel at ease..all of my guys came to me and how me how much they had learned.

    Alabama Power

  • Just wanted to let you know what a fantastic job/effort James put in too insure our guys were thoroughly training and qualified. Everyone involved was very impressed with his knowledge, flexibility,... View More..

    Just wanted to let you know what a fantastic job/effort James put in too insure our guys were thoroughly training and qualified. Everyone involved was very impressed with his knowledge, flexibility, and work ethic. We really appreciate the fact that he went above and beyond.

    EMAC

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WHAT PEOPLE ARE SAYING ABOUT US

  • You Guys Freaking Rock with turnaround time.
    Thank you all SOOOOO much!!

    You Guys Freaking Rock with turnaround time.
    Thank you all SOOOOO much!!

    Welch Allyn

  • BEST is excellent in meeting delivery dates and are very good with clear communication of... View More..

    BEST is excellent in meeting delivery dates and are very good with clear communication of shipments, quantities, issues, etc. Their quality and technical assistance has been superb.

    RW Technologies

  • BEST has solid high quality service every time, and at the right price. They are very dependable. I... View More..

    BEST has solid high quality service every time, and at the right price. They are very dependable. I am able to start a project in less then 24 hours with no hassles. The teams always work to meet the demands placed on them by the customer, and are very honest about what they can do and when they can do it. They offer great value to the customer; they are willing to go the extra mile to make the customer happy.

    Motorola

  • Best has always come through when we needed them. We started using them for board repairs, now they... View More..

    Best has always come through when we needed them. We started using them for board repairs, now they assemble all of our boards. BEST is always responsive to our needs. On many occasions, we needed boards repaired immediately. They have always come through for us.

    Lovejoy Controls Corporation

  • Your company name exemplifies exactly what you are, the BEST!!!

    Your company name exemplifies exactly what you are, the BEST!!!

    Alpha Circuits

  • You guys are really soldering geeks. Keep inventing those cool products.

    You guys are really soldering geeks. Keep inventing those cool products.

    Analog Devices

  • …always are very friendly and try to accommodate my short lead times

    …always are very friendly and try to accommodate my short lead times

    Qualcomm

  • There was not doubt that Francisco know the material, how to present it, and how to make the class... View More..

    There was not doubt that Francisco know the material, how to present it, and how to make the class participants feel at ease..all of my guys came to me and how me how much they had learned.

    Alabama Power

  • Just wanted to let you know what a fantastic job/effort James put in too insure our guys were... View More..

    Just wanted to let you know what a fantastic job/effort James put in too insure our guys were thoroughly training and qualified. Everyone involved was very impressed with his knowledge, flexibility, and work ethic. We really appreciate the fact that he went above and beyond.

    EMAC

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