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PCB Assembly Service

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In assembly the bare board is populated with electronic components, called a "printed circuit board assembly" (PCBA). In through-hole technology, the component leads are inserted in holes surrounded by conductive pads; In surface-mount technology (SMT), the component is placed on the PCB so that the pins line up with the conductive pads or lands on the surfaces of the PCB.

Community > Groups > PCB Assembly Service > wrinkles solder joints found on SOIC and SOT components
wrinkles solder joints found on SOIC and SOT components
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After 2nd time reflow of double reflow, wrinkles solder joints found on SOIC and SOT components.(only happen on the components at the underside of pcb during reflow, top side components dont have this problem) is this due to the reflow process problems? any way to avoid this problem? will it cause any solder joint reliability problem? Thanks
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