Cape Watch
Newsletter June 2014

 

Soldering

Soldering is a process in which two or more metal items are joined together by melting and flowing a filler metal (solder) into the joint, the filler metal having a lower melting point than the adjoining metal. Soldering differs from welding in that soldering does not involve melting the work pieces together but rather in brazing the filler metal melts at a higher temperature, but the work piece metal does not melt.

Silver soldering.
"Hard soldering" or "silver soldering" is used to join precious and semi-precious metals such as gold, silver, brass, and copper. The solder is usually referred to as easy, medium, or hard. This refers to its melting temperature, not the strength of the joint. Silver has a melting point of 618 °C. If multiple joints are needed, then the jeweller will start with hard solder and switch to lower temperature solders for later joints. Silver solder is absorbed by the surrounding metal, resulting in a joint that is actually stronger than the metal being joined. The metal being joined must be perfectly flush, as silver solder cannot normally be used as a filler and any gaps will remain.

Another difference between brazing and soldering is how the solder is applied. In brazing, one generally uses rods that are touched to the joint while being heated. With silver soldering, small pieces of solder wire or plate are placed onto the metal prior to heating. A special flux is used to keep the metal and solder clean and to prevent the solder from moving before it melts.
When silver solder melts, it tends to flow towards the area of greatest heat. Jewellers can somewhat control the direction the solder moves by leading it with a torch; it will even run straight up along a seam.

 

 

Silver solder less 10% for June only

 

Blocks in Easy, Medium & Hard.

less 10%

General guideline for silver melting points :

Easy /Soft = 1325 °F
Medium 1390 °F
Hard = 1425 °F

 

Paste in syringe Easy

S0174
less 10%

 

Rods in easy solder only

S0161
less 10%

 

Solder Bricks
Block 220x110x60mm, Ceramic Porous soldering

S0118
Red R55

S0121
White R115

 

Skamolex Board
Skamolex vermiculite board

S0099
less 10%

 

Flux
AuFlux 500ml

S0136
R30

 

Soldering Brush

B0155
R12

 

Tweezers

TW0074
Bent R14

 

Tw0081
Straight R14

 

 

Don't forget we sell Cubic zirconia's

 

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6th Floor Vunani / Wale Street Chambers , 33 Church Street , Cape Town
PO Box 65, Cape Town, 8001
Tel (021) 424 8261 | Fax: 0867 210 871 | 0861 115 137
Our Site: www.capewatch.co.za | www.jewelquip.co.za | Email: sales@capewatch.co.za

 

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