Hard Facing

Heat Absorbing Paste

View	No.	Attribute	Description
	1	Supplier Part No.	TB0202

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Features

PACWELD 86 gives excellent protection from flame, heat and high temperatures.
1	Excellent shelf-life.
2	Flame resistant.
3	Water soluble.
4	Re-useable.
5	Cohesive.
6	Odourless.
7	Non-toxic.
8	Non-staining.
9	Contains no asbestos, sulphur, phosphorus, beryllium or chlorine.

Typical Application

1	Used where heat transfer from the welding process will damage adjacent materials.
2	Helps prevent distortion, stress, tempering, crystallisation or collapse due to heat retention.
3	Used on materials such as zinc, aluminium, etc.
4	Used to retain heat in a given area.
5	Can be used straight from the container with a spatula or hand to spread over the work area.
6	Used to protect coated and painted surfaces, rubber, plastics, electrical wiring, ceramics, chrome plated parts, fabrics, glass, wood, upholstery and many other materials.

Galvanising Bar

View	No.	Attribute	Description
	1	Supplier Part No.	WC1404
	2	MSDS Available	Yes
	3	Shipping Weight (kg)	5
	4	Diameter (mm)	6.0
	5	Length (mm)	450
	6	Typical Composition (%)	Pb: 51 - 63 Sn: 30 - 37 Zn: 7 - 12

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Features

PACWELD 87 is a special formulated tin, zinc and lead bar used for protective coatings.
1	Melting temperature 183°C.
2	Ideal for replacing burnt galvanising after oxy-acetylene or electric welding.
3	Replaces the protective coating over the complete weld area after welding galvanised material.

Typical Application
- 1 Onsite repair jobs.
  
  2 Galvanising small jobs.
  
  3 Boat trailers.
  
  4 Galvanised fencing.
  
  5 Minor repair work on large galvanised jobs.

Welding Procedure

1	Immediately after welding and while the metal is still hot, chip the slag from the weld area and wire brush the area.
2	Rub PACWELD 87 into the hot area around the weld and wire brush alloy into the area.
3	If the area has cooled off too much or completely, heat the area with oxy-acetylene torch bringing the heat to area to be coated, not directly onto the area and finish the job as above using PACWELD 87.
4	No flux is required.
5	The melting point of PACWELD 87 is over 200°C less than the galvanising material so there is no danger of burning the galvanised surface.

Tubular Hard Facing

View	No.	Attribute	Description
	1	Supplier Part No.	P531 x 6.0mm: WC0803 P531 x 8.0mm: WC0804 P531 x 11.0mm: WC0805
	2	Specification	AS 2576
	3	Classification	2355 - Al
	4	Hardness	Single layer 50 - 55 RC Multi layer 55 - 60 RC (3 - 4 layers)
	5	Sizes/Amps	6.0mm 80 - 130 8.0mm 140 - 190 11.0mm 190 - 280

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Features

1	Low operating currents.
2	Low heat input.
3	Less distortion.
4	High deposition rates.
5	No special storage requirements.
6	Easy to use.

Typical Application
- 1 Crusher hammers.
  
  2 Mantles and liners.
  
  3 Blow bars.
  
  4 Quarry screen plates.
  
  5 Bucket lips and teeth

Welding Procedure

1	Before commencing any welding ensure the surface to be hardfaced is clean by removing rust, dirt, grease and any paint.
2	Do not use excessive amperage.
3	Best results are achieved by holding the electrode perpendicular to the work piece and employing an arc length of approximately 2/3 of the electrode diameter.
4	As the thickness of the deposit increases, it may exhibit surface stress relief cracks which do not penetrate into the base metal and in fact a desirable feature on this type of extremely hard wearing alloy.
5	Optimum hardfacing thickness: 10mm (3 - 4 layers).
6	Can use AC or DC EN (Electrode Negative) or DC EP (Electrode Positive).

Tool Steel Hard Facing Electrode

View	No.	Attribute	Description
	1	Supplier Part No.	P532 x 2.5mm: WC0801 P532 x 3.2mm: WC0802
	2	Specification	AS 2576
	3	Classification	1560 - A3
	4	Hardness as Welded	61 HRc
	5	Sizes/Amps	2.5mm 60 - 90 3.2mm 80 - 120

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Features
- 1 Surfacing or parts subjected to metal to metal wear without thermal shocks.
  
  2 Service temperature maximum: 550ºC.
  
  3 135% recovery.

Typical Application

1	Fabrication or reclamation of high speed steel.
2	Hard facing cutting edges.
3	Cold shear blades.
4	Wire guides.
5	Machine tools.
6	High speed cutting tools.
7	Hardfacing where check cracking is not required.

Welding Procedure

1	No special precautions are required (ambient temperature)
2	If heat treatment is required for a higher hardness refer to PACWELD technical department.
3	AC or DC EN (Electrode Negative).
4	Not machineable unless heat treated, refer PACWELD technical department.
5	All positions (except vertical down).
The pre-heating and interphase temperatures depend on the material and its heat abduction. When overlaying large areas, the higher recommended temperature should be used. The pre-heating temperature for low alloyed base metal should be 300°C - 450°C and for hot-forged steel should be 450°C - 600°C. An increase in hardness and toughness will occur at approximately 530°C. Following annealing, high speed steel tools can be reclaimed (for 2 - 4 hours at 800°C). After that the area needs to be preheated to 500°C - 700°C. Gradual cooling is recommended (ie. oven and sand). Reclaimed tools can be rebuilt by welding layers upon one another. Begin by bringing the base metal up to a hardening temperature and then expose it to air for an appropriate holding time until 400°C - 550°C (depending on the base metal). Welding can begin in this temperature range. The formation of the structure guarantees a reducing of tension and therefore less possibility of cracking. Some oxidation is appropriate after normal cooling.
For simple overlay application: the area to be welded should be brought up to 400°C - 550°C and immediately welded. In this case the blade edges require overlays where they overlap one another to avoid excess wear of the base metal (it will be immediately indicated).