Section III. ACCEPTANCE AND REJECTION CRITERIA

TM 750-245-4

Table 7-1. Mechanical Connections - Continued

Connector type

Illustration

Feedthru terminal bottom termination

Section III. ACCEPTANCE AND REJECTION CRITERIA

7-10. Acceptance Criteria

f. Insulation. The insulation shall not be charred,

All soldered connections shall be inspected for

frayed, split, or pinched through exposing the conductor

conformance to the following conditions:

wire. Slight discoloration of insulation shall not be

considered cause for rejection. Insulation clearance

a. Solder Connection. The solder connection shall

from the solder joint shall be as shown in table 7-2.

have a smooth, bright appearance, without porosity,

cracks, pits that bottom out, or surface strain lines.

g. Capillary Action (Wicking).

Wick length of

Solder shall cover the top of the conductor wire and

solder on the wire strands shall be visible and shall not

concave fillet should be observed between the lower

extend into the insulation.

half of the conductor wire and the terminal. There shall

h. Conductor Wire and Component Lead Tension.

be no foreign material or threads of insulation

All conductor wires and component leads going to a

embedded in the solder.

soldered connection shall have a slack in the form of an

b. Residual Flux. Each soldered connection shall

arc or gradual bend. Solder(d components shall not be

be inspected to determine that all flux has been

in electrical contact with adjacent circuitry; or other

removed.

components.

c. Excessive Solder. Beads or peaks of solder

i. Excessive Heat. Components and insulation

shall not project from the terminal and no solder shall

shall not show evidence of excessive heat caused by

exist as runs on the outside of the terminal. There shall

improper soldering or electrical shorts.

be no solder splatter on the adjacent components or

j. Multiple Terminations.

The number of

surfaces.

connections per terminal shall be in accordance with

d. Cold Solder Joint. The solder shall adhere

system requirements. Each conductor wire shall be

firmly and smoothly to the parts joined. The joint shall

adjacent to the surface of the terminal, not overlapping

not be chalky in appearance, laking metallic luster, nor

another. Multiple connections on terminals shall be as

shall it have a rough, gritty, piled-up surface.

follows:

e. Rosin Joint. Flux shall not be trapped in the

(1) Turret terminals. The wire shall l)e in

solder joint. The conductor wire in the joint shall not

contact with the terminal for the full curvature of the

move under light probing pressure.

wrap and in no case wrapped less than 180

7-7