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SMT Patch Process

• Single-sided assembly

Incoming inspection => screen printing solder paste (spotting glue)=> patch => drying (curing)=> reflux welding => cleaning inspection => rework

• Double-sided assembly

A: incoming inspection =>PCB A surface silk-screen solder paste (dot patch glue)=>PCB> patch PCB surface silk-screen solder paste (dot patch glue). patch =>PCB> drying and reflow welding (preferably only for B surface cleaning =>PCB> detection and rework).

B: incoming inspection =>PCB A surface silk-screen solder paste (spotting glue)=>PCB> patch drying (curing)=>PCB> A surface reflow welding cleaning =>PCB> flip-flop =>PCB =>PCB=>PCB> surface spotting glue/patch curing =>PCB> surface wave soldering inspection and rework)

This process is suitable for PCB A surface reflux welding, B surface wave peak welding. this process is appropriate in PCB SMD assembled on the B surface only if SOT or below the pin.

• Single side mixing process:

A surface silkscreen solder paste (spotting glue)=>PCB> patch =>PCB> drying (curing)=>PCB> reflow soldering =>PCB> cleaning plug-in =>PCB> wave soldering inspection =>PCB> re-repair

• Double-sided mixing process:

B surface patch glue =>PCB> patch =>PCB> curing =>PCB> flip =>PCB =>PCB> wave soldering =>PCB> cleaning and inspection repair

Apply to SMD more than separate components

A surface plug-in (pin bending) B: incoming inspection =>PCB =>PCB> B surface spot patch glue =>PCB> patch cured flip-flop =>PCB> wave soldering inspection and repair

First insert and then paste, suitable for separating components more than SMD components

C: incoming inspection =>PCB A surface silk-screen solder paste =>PCB> patch drying =>PCB> reflux welding plug-in, pin bending =>PCB> flip-flop =>PCB of the B surface spot patch glue, patch curing =>PCB> flip-flop wave soldering cleaning detection =>PCB> rework surface mixed, B surface mount.

D: incoming inspection =>PCB B surface spot patch glue =>PCB> patch cured =>PCB> flip-flop =>PCB A surface silk-screen solder paste patch surface reflow welding plug-in =>PCB> B surface wave soldering cleaning detection =>PCB> rework surface mixing, surface mount. B surface silk-screen solder paste (spotting glue)==>PCB patch ==>PCB drying (curing)==>PCB A surface silk-screen solder paste =>PCB reflow soldering, patch drying = reflow soldering 1(local welding can be used), plug-in, wave soldering 2(if insert components are few ==>PCB, Manual welding can be used)==>PCB cleaning ==>PCB testing ==>PCB rework A surface mount, B surface mix.

• Double-sided assembly process

A: incoming inspection, PCB A silk-screen solder paste (patch glue), patch, drying (curing), A surface reflow welding, cleaning, flip plate; PCB silk-screen solder paste (patch glue), patch, drying, reflow welding (preferably only for B surface, cleaning, testing, rework)

This process is suitable for PCB with large SMD such as PLCC on both sides.

B: incoming inspection, PCB A surface silk-screen solder paste (spot patch glue), patch, drying (curing), A surface reflow welding, cleaning, flip plate; PCB surface spot patch glue, patch, curing, B surface wave soldering, cleaning, testing, rework) this process is suitable for reflow on PCB surface.

contact

Name:Brynn

Email :Brynn@eton-mounter.com

WeChat:13802252825

Telephone:138 0225 2825