Seiko 7C17 User Manual download pdf (Page 17)

Soldering Principles – Set-Up Description

Apollo Seiko has designed this robotic soldering system (Model L-CAT EVO, Luna, Terra)

around the soldering principles of an efficient hand soldering operation. The soldering steps are

as follows:

Step 01: Introduce flux to remove any oxidation & clean the surface

Step 02: Feed a small amount of wire to assist in “wetting”

Step 03: Pre-heat the joint

Step 04: When the joint is hot enough, feed additional solder to allow for a solid

electrical, mechanical connection

Step 05: Retract the solder wire

Step 06: Maintain heat to the joint until solder flows as desired

Step 07: Repeat process

With hand soldering an operator has the dexterity to move the solder wire where it is needed. In

a robotic environment, the process is not as flexible but is very consistent. Solder feed set-up is

the most critical process of the entire system. If the solder feed system is not set up properly,

solder joint quality will always be compromised.

Solder Wire: Example wire specification:

Alloy SAC 305

Diameter .032” (0.8 mm)

Flux No-Clean # 245

Flux Percentage P3 (3.3%)

The Apollo Seiko selective soldering systems can feed a wide variety of solder diameters. The

minimum diameter is 0.5 mm (0.020”) up to 1.6 mm (0.064”). The solder is fed into one solder

feed tube from the reel. The feed tube is a 2-part tube. The outer sleeve is Nylon and the inner

sleeve is Teflon. The Teflon inner sleeve is designed to be solder diameter specific. For

example, when using 0.031” diameter wire, the inside diameter (ID) is approx. 0.004” wider than

the wire. This prevents the solder wire from bending, kinking and mis-feeding.

In order to change solder wire diameter you must change the following items:

a) Solder Feed Tube b) Manually Adjust Feed Roller Distance

ZSB Feeding System:

The feeders that have been installed on your soldering robots are known as ZSB (Zero Solder Ball)

feeders. The concept of the ZSB feeder is to reduce the occurrence of solder balls.

The feed rollers have a micro-gear that penetrates the solder wire to the flux core. The additional

benefit of this feeding system is very precise solder wire feeding. This feeding system is NOT

available with solder wires with a diameter larger than 1.6 mm.

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Seiko 7C17 User Manual Page 17