Diverse WLC100 Podręcznik - Strona 2

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THE AMOUNT OF SOLDER AND QUALITY CONTROL

a) Minimum amount of solder.

b) Optimum amount of solder. The solder should cover the pad and wire.

There should be some wicking action of the solder up onto the wire.

The surface of the solder should be smooth and shiny.

c) Excessive solder, hides the connection from being checked. There is

also the possibility that solder could bridge between traces and cause

a short circuit.

DIFFERENT TYPES OF BAD SOLDER JOINTS

a) Bad soldering of terminal wire. The wire was not heated enough and the

solder did not wet the top. This wire could pull away from the joint.

b) Bad soldering of PCB trace. The trace was not heated enough to let the

solder wet and flow over the surface of the trace. The solder can pull

away from the trace if strained. This can also occur if the trace was not

cleaned or not enough flux was used.

c) Bad soldering of terminal wire and PCB trace. This is a cold solder

joint where the soldering iron was not held on the joint long enough to

heat the joint sufficiently and where some movement of the joint could

have occurred before the solder cooled. It will appear to have a rough

textured surface. This can be corrected by reheating the joint until the

solder flows and adding a small amount of flux.

SELECTION OF WELLER

Weller

tips are solid copper, plated with iron, nickel, and chromium. The chromium is eliminated from the working area and

the tips are pre-tinned with tin/lead solder. The nickel and chromium protect the shank from corrosion and solder creep. The

Weller

WLC100 uses the ST series tips.

CARE OF WELLER

SOLDERING TIPS

1. Keep tip tinned; wipe only before using.

2. Use rosin or activated rosin fluxes. Acid type fluxes will greatly reduce tip life.

3. Remove tip and clean with suitable cleaner for flux used. The frequency of cleaning will depend on the type of work

and usage. Tips in constant use should be removed and cleaned at least once a week.

4. Dont try to clean tip with abrasive materials and never file tip; to do so will greatly reduce tip life. Tip wettability is

affected by contact with organics such as plastic rosins, silicone grease, and other chemicals. If the tip becomes

unwettable it may be cleaned with a Weller® Polishing Bar Part Number WPB1. Do not overdo this or the iron

plating will be removed and the tip will be ruined. Re-tin tip immediately to prevent oxidation.

5. Dont remove excess solder from heated tip before storing. The excess solder will prevent oxidation of the wettable

surface when the tip is reheated.

Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176

THE CORRECT WAY TO SOLDER

Always use the soldering iron to heat

the joint, not the solder. A small

amount of fresh solder on the tip will

help conduct heat to the joint faster.

The solder should be heated by the

joint so it will flow into and around the

connection resulting in a stronger joint.

ST SERIES TIPS

FAX 781.665.0780 - TestEquipmentDepot.com