IPC 7711A.pdf - 第202页
NOTE Flux contained in flux-cored solders should be sufficient to clean and solder splices. If external flux is used, the chance of solder wicking beneath the insulation of stranded wire is increased. 10. Clean, as requi…
EQUIPMENT REQUIRED
Soldering system
Soldering handpiece
Chisel tip
MATERIAL
Flux
Flux-cored solder
Insulative tubing
NOTE
The contact area between the two wires shall be a minimum of three wraps of each
wire around itself.
PROCEDURE
1. Install tip.
2. Start with tip temperature of approximately 260°C and change as necessary.
3. Strip and pre-tin stranded wires in accordance with guidelines identified in para-
graph 7 in 8.1. (See Figure 1.)
4. Place sleeving/tubing/wire designations, etc., onto wire. Ensure that the sleeving/
tubing length is sufficient to extend over the wire’s insulation, on both sides of the
spliced area, a distance of three times the wire insulation diameter. The tubing’s
inside diameter should be selected to facilitate (after shrinking) a snug, firm fit over
the wire insulation.
WIRE SPLICING
5. Form a 180° bend in each wire, ensure that the wire strands have not been
separated during this process. (See Figure 2.)
6. Securing one wire firmly, begin the wrap motion of the opposite wire until one turn
is completed. (See Figure 3.)
7. Firmly secure the remaining wire and begin wrap motion in the opposite direction.
Upon completion of one wrap on each wire, complete the wrapping process to
obtain the three wire wrap minimum requirement. (See Figure 4.)
8. Terminate any remaining wire length using a flush cut pattern. (This eliminates any
wire protrusion that could extend beyond the outer circumference of the wrap
and cause damage to the insulation/tubing that could result in a short.) (See Fig-
ure 4.)
9. Select appropriate heating element to establish a heat bridge and minimize the
effect of solder wicking beneath insulation. Solder in accordance with paragraph
9 in 8.1.
Figure 1 Strip and Tin Wires
Figure 2 Form 180° Bend
Figure 3 Wrap in Opposite Direction
Figure 4 Solder Connections
3 Wraps Min.
Figure 5 Cover with Heat-Shrinkable
Tubing
3 Wraps Min.
7711A
Rework of
Electronic Assemblies
Revision:
Date: 2/98
Hook Splice
Number: 8.1.3
Product Class: N/A
Skill Level: Intermediate
Level of Conformance: Low
Material in this manual, IPC-7711 Rework of Electronic Assemblies, was voluntarily established by Technical Committees of
IPC. This material is advisory only and its use or adaptation is entirely voluntary. IPC disclaims all liability of any kind as to the
use, application, or adaptation of this material. Users are also wholly responsible for protecting themselves against all claims
or liabilities for patent infringement. Equipment referenced is for the convenience of the user and does not imply endorsement
by IPC.
Page1of2
Copyright Association Connecting Electronics Industries
Provided by IHS under license with IPC
Not for Resale
No reproduction or networking permitted without license from IHS
--``,``,-`-`,,`,,`,`,,`---
NOTE
Flux contained in flux-cored solders should be sufficient to clean and solder splices.
If external flux is used, the chance of solder wicking beneath the insulation of
stranded wire is increased.
10. Clean, as required, and inspect.
11. Position insulation sleeve/tubing over the spliced area, apply heat to shrink to a
snug fit over the splice and wire. (See Figure 5.)
IPC-7711A
Number: 8.1.3
Revision:
Date: 2/98
Subject: Hook Splice
Page2of2
Copyright Association Connecting Electronics Industries
Provided by IHS under license with IPC
Not for Resale
No reproduction or networking permitted without license from IHS
--``,``,-`-`,,`,,`,`,,`---
EQUIPMENT REQUIRED
Soldering system
Soldering handpiece
Chisel tip
MATERIALS
Flux
Flux-cored solder
Insulative tubing
PROCEDURE
1. Install tip
2. Start with tip temperature of approximately 260°C and change as necessary.
3. Strip the wires. Each wire end should have the same length of insulation removed
so that they appear identical. Each wire end should be stripped a minimum of four
(four) wire diameters (a wire diameter is the outside diameter of the insulator
which covers the conductor). Pre-tin wires in accordance with guidelines in para-
graph 7 in 8.1. (See Figure 1.)
4. Place shrink-sleeving/tubing/wire designators, etc. onto the wire to be spliced
and slide down the wire far enough to avoid interference during soldering. The
inside diameter of the shrink-sleeving should be selected to ensure that a snug,
firm, weather-tight seal will exist after shrinking.
NOTE
Step three (below) requires a single strand of wire, approximately 7.5 cm long, to be
available for wrapping the overlapped wire ends. It is easiest to strip 7.5 cm of wire
by making 3 separate strips (each approximately 2.5 cm long from the spool/reel of
repair wire).
5. If possible, position wires on a flat surface so that the tinned lengths of wire over-
lap and are against each other (like the first two fingers on your hand) and the end
of wire ‘‘a’’ butts against the ends of the insulation of wire ‘‘b.’’ (See Figure 2.) If
identical lengths of insulation were removed, then the end of wire ‘‘b’’ will butt
against the insulation of wire ‘‘a.’’ If it is not possible to position the wires on a flat
surface, then position the wires as described above and secure in position using
hemostats, alligator clips, etc. As a last ditch expedient, the wires can be tack
soldered into the described position. If tack soldered, do not add solder, just heat
the wires sufficiently to achieve a solder bond between the tinned wires.
6. Using a single strand of wire (approximately #30 awg) from a stranded wire (see
Note above), wrap the overlapped wires to achieve sufficient mechanical security
to prevent movement of the overlapped ends during soldering. (See Figure 3.)
Figure 1 Strip and Tin Wires
Figure 2 Line Up Wires
Figure 3 Wrap with #30 Awg Wire
Figure 4 Solder Connection
Figure 5 Cover with Heat-Shrinkable
Tubing
7711A
Rework of
Electronic Assemblies
Revision:
Date: 2/98
Lap Splices
Number: 8.1.4
Product Class: N/A
Skill Level: Intermediate
Level of Conformance: Low
Material in this manual, IPC-7711 Rework of Electronic Assemblies, was voluntarily established by Technical Committees of
IPC. This material is advisory only and its use or adaptation is entirely voluntary. IPC disclaims all liability of any kind as to the
use, application, or adaptation of this material. Users are also wholly responsible for protecting themselves against all claims
or liabilities for patent infringement. Equipment referenced is for the convenience of the user and does not imply endorsement
by IPC.
Page1of2
Copyright Association Connecting Electronics Industries
Provided by IHS under license with IPC
Not for Resale
No reproduction or networking permitted without license from IHS
--``,``,-`-`,,`,,`,`,,`---