Professional Bench/Welding Technologies
Repairing Moissanite Necklace with Pulse Arc-Welding
Knowing how to tack-, fusion- and pulse-arc-weld at the bench saves time, increases quality
and drives up profits for your shop and service department
A few links broke when this necklace containing Charles & Colvard created moissanite was pulled. Repairing the links using pulse-arc welding technology averts freezing links, reduces oxidation and decreases the time required for clean-up as opposed to using a torch to complete the repair.
The necklace is broken in three locations. The lower gallery wire is broken at location A and the joining link wires are broken at B & C.
Heres a closer look from the back of the broken links. To prepare the links for reassembly, I use a small cylinder bur to remove the broken soldered wire joiner from each link (D & E).
To prepare this link for reassembly, I remove the U-shaped wire by sawing then use a cylinder bur to remove the remaining part of the wire joiner (G). I clean out all traces of solder from the adjoining links used in the original assembly. I use the ABI Pulse-Arc Welder to permanently rejoin the lower gallery wire to the base of the link. Then I set the welder on the high energy setting at 30 volts and use the #1 tip on the weld pencil. It takes three pulses of energy to complete the weld joint.
To rejoin all broken links, I make new U-shaped wire joiners from 14k white gold wire measuring 0.82mm in diameter. After shaping them, I insert each in one side of the adjoining broken links as shown at (H).
Next I place the adjoining link in position (I) and hold the two links together firmly.
I tack the joining wire on one side (J) using the pulse-arc welder on the high energy setting at 35 volts with the #1 tip. The weld pencil is always hooked to the positive terminal. I use the alligator clip lead to complete the electrical circuit and hook it to one of the links and the negative terminal. After tacking the joining wire, I permanently join the opposite side (K) using the same equipment settings. After using a few pulses of energy, I go back to the first joint (J) and hit it with a few pulses of energy for a permanent weld.
After rejoining all links, I use rubberized abrasives to clean the joints and a bristle brush to polish. No torch work is required to complete the reconstruction.
Important: Tack-, fusion- and pulse-arc equipment settings will differ and are based on the volume, amount of contact and alloy of the material you are working with. Practicing using like materials will give you a parameter for the settings required for your application. Keep a record of settings and tasks for future reference.
For questions on this process, contact Mark B. Mann at firstname.lastname@example.org or (406) 961-4426. To view related welding procedures, visit www.visualcominc.com.
This installment is sponsored by ABI, Cranston, RI. For general information on ABI equipment and procedures or for a list of distributors, call Janet Kirk at (888) 494-2663.
by Mark B. Mann
Photographs by Mark B. Mann
Visual Communications, Inc. © 2004