Table 7-8. Solder Coverage

TM 750-245-4

Table 7-7. Solder Coverage - Printed Circuit - Continued

Inspection criteria

Illustration

Insufficient solder

Table 7-8. Solder Coverage - Connector Pins

Inspection criteria

Illustration

ACCEPTABLE

No surface imperfections

Concave shape, heat, bright solder

Good wetting of pin and pad

Pin contour is well defined

MINIMUM ACCEPTABLE

Minor surface imperfections

Visible line of demarcation between solder and

pin. However, solder flow is not broken. Pin is

completely tinned.

Maximum solder but pin contour is discernible

REJECT

Excess solder

Evidence of dewetting, solder does not cover pad,

base metal showing

Solder incomplete on tip of pin. Base metal

showing. Evidence of contamination indicated

by failure of pins to tin. Note definite break

between pins and solder fillets.

7-17