Spare parts for IZ and Weldy machines

Welding machines are simple, robust and entirely dependent on a small number of parts that wear out predictably. Nothing about that is a defect. A heating element has a service life, drive rollers glaze, weld shoes wear to a new profile, carbon brushes shorten. The question is never whether they will need replacing but whether the replacement is on a shelf in Dubai or on a lead time from a factory abroad.

That is the whole argument for holding parts locally, and it is why we do. A contractor in Sharjah can have an element the same day. A crew in East Africa can have one on the next flight rather than waiting for a European manufacturer's order cycle.

What wears, and what it does to the weld

Worn parts rarely stop a machine outright. They degrade the seam quietly, which is worse, because the work continues and the problem is discovered at testing.

Heating elements lose the ability to hold temperature under load before they fail completely. The machine looks fine while idling and drops away while welding.

Drive and pressure rollers glaze with heat and use. A glazed roller slips, so travel speed becomes inconsistent even though the display shows a steady figure, and joining pressure falls off.

Weld shoes on an extruder wear to a different profile than they started with, changing the shape and dimension of the bead being laid down.

Nozzles distort and partly block, altering the air pattern and therefore how much preheat actually reaches the sheet.

Carbon brushes shorten until the motor runs erratically or stops entirely, usually at the least convenient moment.

Specification

Listed against the machine they belong to, using the manufacturer part names from each technical datasheet. Quote the model and the part name and there is no ambiguity about what arrives.

Welding boots and nozzles are matched to the joint and the machine, not interchangeable across makes. Send the model, the part name from the list above and a photograph of the worn item. That combination avoids the wrong part travelling a long way.

Parts by machine

Part names below are taken from each machine's technical datasheet, so quoting the model and the name removes any ambiguity about what you are asking for.

IZ-900 wedge welder

Main assemblies are the pressure handle, operating handle, electric box, heating plate, pressure wheel, casters, swing head and pressure adjustment nut.

The parts that actually get replaced are the hot wedge knife assembly and its electric heating tube, the thermocouple, the drive motor and motor drive board, the heating drive board, and the display or main control board. Electrically it carries a 10 A power fuse and a separate 1.5 A motor fuse, both worth carrying spare because a blown fuse presents exactly like a dead machine.

Fault codes on the temperature interface point straight at a part. Code 002 means the temperature exceeded its limit for more than ten seconds, which points at the thermocouple or the control board. Code 005 is a thermocouple open circuit. On the motor side, code 003 is a loose Hall connector wire before it is a failed motor, so check the wiring before ordering anything.

IZ-620 extrusion welder

Assemblies are the hot air welding gun, Y-shaped extrusion gun body, feed gun body, feed inlet, air outlet, welding boots, hoop, assist handle, placement rack, drive motor and the temperature and speed adjustment knobs.

Two welding boots are supplied as standard, a flat boot and a right angle boot, and they are changed to suit the joint rather than because they have worn out. Change them hot: heating the boot before removal stops old material sticking as it comes away, and never knock a boot off.

Consumable parts are the extrusion screw and cutting blade, the feed screw, the heating gun core and its circuit board, and carbon brushes for both the hot air gun and the drive motor.

IZ-1600 hot air gun

The gun is built from an air duct, outer cover, shockproof pad, handle, potentiometer, power switch and power cord. Wear items are the heating element, the carbon brushes and the air filter.

Both the heating element and the air filter are user replaceable, and the manual sets out the sequence for each. Cleaning the filter is a three step job and worth doing regularly, because a blocked filter starves the element of airflow and shortens its life.

Nozzles for the IZ-1600

Nozzle choice changes what the gun can do more than the gun body does. Eight are available.

Weldy accessories and welding shoes

For the Weldy range we stock the consumables and shoes Weldy list against each machine, by article number.

Welding shoes for the booster EX2 and EX3

Thirteen shoes, each matched to a joint profile. The EX2 kit ships with K8/10 and the EX3 kit with UBL30/1.5; the rest are ordered to the work.

For geomembrane work the overlap shoes UBL25, UBL30 and UBL35 are the ones that matter. They lay a bead across a sheet edge at three widths.

Carbon brushes: replace them before they fail

This is the single most useful maintenance figure in the manuals. Carbon brushes in both the IZ-620 hot air gun and its drive motor have a service life of roughly 1,600 hours. The manufacturer's instruction is to replace them in advance rather than run them to destruction.

The reason is not the brushes themselves, which are inexpensive. It is what happens when they wear out completely: the motor runs erratically, then stops, and on an extruder that can happen with material sitting in a hot barrel. At roughly 1,600 hours a crew welding steadily will reach that point inside a year. Log the hours and change them on schedule, and carry a spare set regardless.

What the warranty covers, and what it does not

Machines carry a one year warranty on motors and circuit boards from the date of sale, covering faults from material or manufacturing defects.

It does not cover wearing parts. On the wedge welder that means hot wedges, bearings, chains, rollers and appearance parts. On the hot air gun it means heating elements, carbon brushes and bearings. Nor does it cover damage from improper handling or maintenance, unauthorised modification, or a machine that has been dropped or crushed.

That is a normal and reasonable split, and it is worth understanding before you need it. The parts most likely to need replacing are precisely the ones a warranty never covers on any brand, which is the practical argument for holding them on the shelf rather than budgeting for them as warranty claims.

A working spares list

What a crew should have in the container before mobilising to a site where nothing can be bought locally.

Daily maintenance that extends part life

• Clean sand and debris off the drive wheel and hot wedge after every shift, check for loose screws, and oil the points that need lubrication. In this region sand is the main enemy of a wedge welder.
• Purge the extruder before shutting down. Material left to cook in a hot barrel degrades and contaminates the next bead, and can seize the blade.
• Let hot air machines cool before switching off. On the IZ-1600 that means turning the potentiometer to zero and waiting five minutes with the fan still running.
• If a machine has been idle a long time or has got damp, preheat it for 30 minutes before use rather than putting it straight to work.
• Change welding boots hot, never by knocking them off.
• Check cables and site power. Damaged leads and undersized extensions cause more machine faults than the machines do, and the manuals require a properly earthed supply with a leakage protector.

Frequently asked questions

For the full picture, see what we hold as a geomembrane welding machine supplier in Dubai.