The arc is on same side of workpiece as laser which allows doubling of welding speed for a modest increase in capital cost. The locking only happens for arcs with a low current and refore slow cathode jet.

In this mode, laser light forms a filament of vaporized material know as a ?keyhole? that extends into material and provides conduit for laser light to be efficiently delivered into material.

Following problems are faced while laser welding heat resistant alloys:
– Brittle welds
– Segregation problems
– Cracking.

The independent, simultaneous movement of all four axes (X, Y, U, V) makes machining extrusion dies, airfoil shapes, and “squircles” (a square shape on top, and a circle on bottom of workpiece) quite easy.

The main issues laser welding are:
? crack sensitivity,
? porosity,
? HAZ embrittlement
? poor absorption of radiation.

The electric discharge style CO₂ gas lasers are most efficient type currently available for high power laser beam material processing. Dye lasers use complex organic dyes like rhodamine 6G.

There is a need to cut ejector to a right dimension and if cavity surface is shaped re is also a need to shape ejector end. The wire ED machine is one of most accurate machines in mould shops and usually re is also free machining time available. Anor option is to cut and shape ejectors in a milling machine, but most accurate milling machines are used in mould cavity machining operations and normally y are rar busy for long periods of time.

Wire cut EDM has a broad range of applications that are continuing to grow. Some of m are listed below:
. Parts with complex geometry?s
. Parts requiring “tenths” tolerances
. Parts where burrs can?t be tolerated
. Thin or delicate parts that are susceptible to tool pressure
. Progressive, blanking and trim dies
. Extrusion dies
Precious metals
. Narrow slots and keyways
. Mold components
. Tooling for forging, or injection molding operations.
. Medical and dental instrumentation
. Cutting hardened materials such as carbide, C.B.N. and P.C.D.
Cutting difficult to machine materials like hastaloy, inconel and titanium
. Aerospace, defense and electronic parts
. Prototypes parts
Production parts
Form tools and inserts
Electrodes (graphite or copper) for vertical EDM.

The energy transmission mode of conduction welding is used with materials that transmit near infrared radiation, notably polymer. Absorption of infrared radiation has nothing to do with weldability of materials.

The wire tip segment that was clamped is disposed of in a wire tip disposal unit. The supply wire is n directed into lower guide. The wire n proceeds to back of machine where it is discarded in a scrap wire bin.