Introduction

The thermo welding system is an easy simple to use field/process for welding copper to copper or copper to steel, without the use of an external power source. Thermite connections utilize the high temperature reaction of powdered copper oxide and aluminum , which when ignited, produce aluminum oxide (in the form of slag) and super-heated copper.
The reaction takes place in a semi permanent graphite mould where the materials are joint and positioned.
When the total mass of powder becomes super heated molten copper, it flows through the mould onto the conductors to be joined by melting a thin steel disc which previously has stopped the powder from dropping through the mould.
This causes the conductors or surfaces to melt and form a fusion weld between them.
All connections in the earthing system shall be made by the thermo welding process as BS 6651(1992) STATES:
Exothermic welded joints will intimately join the cable with a connector or material that has about the same fusing temperature, so that the entire connection can be viewed and rated as being an integral part of one homogeneous conductor.

THE THERMITE WELD EFFICIENCY
A thermite connection becomes an integral part of the conductors. The thermite connection is a fusion or molecular weld of virtually pure copper. The finished connection in the majority of cases sectional area of the conductors being welded and therefore:

1) Will not be affected by high current surges. Tests have shown that the electrical conductor will melt before the thermite connection when subjected to short circuit current.

2) Will not loosen of corrode at the point of weld. There are no contact surfaces or mechanical pressures involved.

3) Has a current carrying capacity equal to or greater than that of the conductors welded.

4) Other efficiencies are:

Will not deteriorate with age.
Will withstand repeated faults.
Has low labour costs.
Is time saving on jobside.

Requires no special skills.

Can be checked for quality by visual inspection.

Requires no external power or heat.

Maintenance saving as the welds are unaffected by oxidation and fault currents

GENERAL WELDING PROCEDURE

1. Insert the conductor (or conductors) into mould; nothing any special information under “positioning” for application type.
2. Lock mould, insert steel disk.
3. Dump cartridge into crucible and close cover.
4. Ignite it, and after finishing of thermite reaction, remove all slag from mould before making next weld. Clean cover after every 6 to 10 welds.
 

When drawing out the connection, keep mould fully open for avoiding inside edges to break. Don’t make fast removements.

Petweld Equipment & Accessories

	Graphite Mould
	Handle clamp & Fastening
	Petweld Cartridge
	Tool kits
	Tool Boxes
	Petweld Sleeves

Petweld Connections

	Cable to Cable
	Cable or Rod to Rod
	Cable to Armature
	Bus-Bar to Bus-Bar
	Cable to Bus-Bar or Surface
	Cable or Bus-Bur or Surface or Rod or Lug
	Others