Upload
esther-riley
View
217
Download
0
Tags:
Embed Size (px)
Citation preview
Wire repairs
Connecting Wires
Very quick but... Will it last? Is this a
professional job? Would you pay a
technician $75 per hour for this?
Crimp connectors Advantages
Disadvantages
Solder connections
A connection that will last.
For important circuits soldering is the preferred methodof joining wires and terminals
Selecting the solder to use
Metal content 40/60 or . . .
Core flux type Rosin or Acid
Solder Composition 40/60
360 – 460 = 100 degree pasty range
60/40 360 – 375 = 15 degree pasty range
Impurities Are a possible problem in lower priced solders
Why is flux needed?
Oxidation Definition: A common form of chemical
reaction which is the combining of oxygen with various elements and compounds. The corrosion of metals is a form of oxidation, rust on iron for example is iron oxide
The problem Oxidation will occur to a wire while it’s being
heated to solder.
Flux Requirements Remove oxidation Prevent oxidation at soldering temperatures Be easily displaced by molten solder Be easily removed if needed
Flux Types Acid
Strong but always active Rosin
Weak but works well with new wires and terminals. Active only at high temperatures Leaves a protective coating at lower temperatures
Active temperatures of flux Rosin Flux
starts working at 225 degrees
Acid Flux Active even at room temperature
Selecting the right gun for the job
Gun Preparation
Tighten the tips connection to the gun Clean and sand the tip Tin the tip
Joining wires
Careful how you shape the twisted wires
Taping this wire into a harness with others will be difficult Correct method
What is a Cold Joint?
Cold Joint
You want the solder to flow
Let the wire or terminal melt the Solder
Note… The solder wire is not touching the iron
Protecting the wiring connection
Heat Shrink Installation
Demonstration and Assignments