Master PROHEAT PH-1200A User manual

P RO H EAT
®
Plastic Welding Kit
Welding Plastics

PH-1200A
Fan Speed: 4 LED lights
Temperature: 6 LED lights
PH-1400A
Programmable
MASTER WELDING TIPS AND ATTACHMENTS
35017
1 1/4” Shrink attachment
Reects air around
surface’s such as tubing
or pipe
35269
Welding Shoe
For softening and spreading
plastics and embedding mesh
screen. Use with 3/8” reducer.
35271
Tack Welding Tip
For tack welding two pieces
together before adding ller
rod. Use with 3/8” reducer.
35293
5/8” (14 mm) Reducer
Concentrates air ow
35294
3/8” (9 mm) Reducer
Concentrates air ow. Also
used with weld tips and free-
hand “pendulum” welding.
35295
Speed Welding Tip
For welding rod up to 6mm,
Use with 3/8” reducer
35698
Wire Mesh Screen,
stainless
For reinforcing weld
repairs. Size: 4” x 3”.
Qty 4 per pack.
PH-1200A
• LED display of temperature and airow settings, 4 airow and 6 temperature settings.
• Variable temperatures from ambient temperature to 1,200° F.
• Variable airow from 4 CFM to 18 CFM.
• Control system prevents overheating when using specialty attachments.
PH-1400A
• Programmable LCD display of temperature and airow settings (up to 5 programs).
• Variable temperatures in 10°F increments from ambient temperature to 1,200° F.
• Dial-in airow from 4 CFM to 18 CFM.
• Control system prevents overheating when using specialty attachments.
• Temperature & airow lock-in feature.

AVAILABLE ACCESSORIES (www.masterappliance.com):
35016
3” (75 mm) Spreader
Spreads air evenly over
wide areas
35266
1 1/2” 40mm Angle Slit
Nozzle
Lap welds roong mate-
rials
35267
3” (75mm) Teon Coated
Butt Welding Heat Disc
For butt welding
PVC pipes
35268
1 1/2” (40mm) Lap
Welding Slit Nozzle
For lap welding PVC
Sheeting
35296
3/4” (20 mm) Lap Welding Tip
For lap welding plastic ma-
terials, such as PE, PVC, or
Vinyl tarpaulin. Use with 3/8”
reducer.
35291
Seam Roller with ball
bearings
For lap welding,
edging tape and
roong applications
35297
ABS Welding Rod
(Pkg. of 16)
Round, 1/8” Dia. x 9” Long, Natural,
for welding ABS plastics
35298
PP Welding Rod
(Pkg. of 16)
Round, 1/8” Dia. x 9” Long, Natural,
for welding PP plastics
35299
PVC Welding Rod
(Pkg of 16)
Round, 1/8” Dia. x 9” Long, Grey,
for welding PP plastics
35300
LDPE Welding Rod
(Pkg of 16)
Round, 1/8” Dia. x 9” Long, Natural,
for welding LDPE plastics
35301
HDPE Welding Rod
(Pkg. of 16)
Round, 1/8” Dia. x 9” Long, Black,
for welding HDPE plastics
35697
Fiber-Flex Hot Melt Adhesive Rod
(Pkg. of 9)
Round, 3/16” Dia. x 12” Long, Black,
“Universal” rod, works best with PP
and TPO plastics.
MASTER WELD RODS
SDS Sheets available upon request.
Warning: These products contain chemicals known to the State of California to cause
cancer and birth defects or other reproductive harm. Users should independently evaluate
the suitability of the product for their application.

PLASTIC WELDING
Basic requirements for plastic welding. TIME, TEMPERATURE & PRESSURE
Most plastics used today are thermoplastics which can be softened by heat and
then hardened again upon cooling. Thermoplastics are generally suitable for re-
pair by welding. Thermoset plastics, on the other hand, do not soften by heating
after their initial molding. Thermosets cannot be welded with heat.
Four basic rules for plastic welding are suggested:
1. Weld with like material. Only like materials can be fusion welded, for exam-
ple, PP rod on PP plastic. If material is unknown, then the ber-ex hot melt
adhesive rods can be used as described below. Fiber-ex is an adhesive and
will not fusion bond with the base material so the rod should be used with a
mesh screen if strength is required; otherwise, it can be used to ll gaps/holes
where strength is not required.
2. Correct temperature. The plastic should be pre-heated. Select the right tem-
perature matched to the material being repaired.
3. Even pressure. When welding with rods, the pressure is applied by pressing
on the welding rod. For overlap welding of lms and tarpaulins, the necessary
pressure is applied with the help of the optional pressure roller.
4. Constant welding speed. To achieve a good weld, an even working speed
should be maintained. When welding plastics with the Master Proheat, the
following three variables are critical to achieve a good weld.
TIME, TEMPERATURE & PRESSURE
• Time. If you move the heat tool too fast or too slow, the quality of the weld will
be compromised. Maintain constant speed during the welding process.
• Temperature. Set the welding temperature for the plastic that you are welding.
Adjust the temperature and airow to obtain the best setting combination for
the plastic you are working with. Locking-in the setting enables you to main-
tain the set temperature throughout the welding process. The Master Proheat
Model PH-1400A has the ability to tightly control and lock-in the temperature
through an on-board electronically controlled temperature and air speed sys-
tem. See the heat gun instruction manual on how to lock-in settings.
• Pressure. Pressure is applied by pushing down on the welding rod while weld-
ing or, if butt welding, on the two edges that are being welded together. Master
Appliance Corp. manufactures precise welding tips that help the welder apply
equal pressure throughout the welding process.
Thermoplastic welding temperatures.
There are different types of plastic so it is important to identify the type you are
working on to ensure the proper welding rod is being used. Thermoplastics can
be formed with heat and can be easily welded. Thermosets (Duroplastics and
Elastomers) cannot be welded. Thermosets are hardened with heat but, once
hardened, their shape cannot be changed with heat. Elastomers (rubber) can be
formed with heat but cannot be welded.

The following tables list approximate temperatures and air ow settings. The
user should practice on a scrap piece of plastic to verify before starting the re-
pair project.
Testing the weld rod: Temperature setting is correct when the rod becomes
soft and tacky. If the rod starts to liquefy the temperature setting is too hot.
Practice: Actual temperature may vary from the set temperature of the Proheat
®
heat gun, based upon distance from the nozzle of heat gun. Welding plastics
takes patience and repetition to become procient.
Plastic Welding
Clean the damaged area with warm soapy water and dry off. Align parts to be
joined as needed for welding, using clamps if possible to keep parts from mov-
ing. Break the edges of the parts to create a V-shaped groove to provide space
for weld ll. Install the appropriate welding tip onto your Master Proheat
®
heat
gun. Preheat the heat gun for approximately 1 minute to desired temperature
before starting the welding process. Use extreme caution. Read and understand
the instruction manual before use of this tool.
Weld rod should have a clean end to start welding. Once the heat tool is at the
proper temperature, place the heated speed-weld tip on the surface of the plas-
tic part you need to weld. When the surface of the plastic part begins to soften,
feed your plastic welding rod into the preheated speed-weld tip and feed your
rod in a steady motion moving your speed-welding tip along the repair joint. Do
not pull on the rod, let the rod soften into the joint as you move steadily along
the weld joint.
Watch the area where the rod meets the plastic part. You should see a small
puddle of softened plastic owing in front of the weld rod. This will conrm that
you have the proper heat setting and speed. If the surface of the piece being
welded starts to burn, pull the heat tool at a faster pace to avoid overheating.
PH-1400A
PH-1200A
PH-1200A Approximate Temperature versus LED Display (Total of 6 LED lights):
0 = No Heat, 1 = 160°F, 2 = 360°F, 3 = 550°F, 4 = 750°F, 5 = 950°F, 6 = 1200°F.

At the end of the weld joint cut the rod off with knife or side cutter. Allow the weld
joint to cool to room temperature before testing the strength of weld. Depending
on the thickness of the rod and/or the base material, more than one pass may
be necessary.
Edge Welds Butt Welds, note V groove preparation
Weld Types:
Many of the plastic welds are similar to metal welds and use some of the same
welding techniques. Weld edges are grooved before welding to allow easy lling
with weld rod.
Proper and Improper Weld Illustrations:
No Bond: rods not com-
pletely fused and weld can
be pulled apart.
Burned Weld and charred:
rods not completely fused
(weak weld)
Proper Weld: rods fused.
Inside Corner Welds Outside Corner Welds
Fillets and Corner Welds Single “V” Butt Welds
Double “V” Butt Welds Overlap Fillet Welds
Edge Welds Butt Welds, note V groove preparation

Pendulum Weld: Freehand welding.
Slowly rotate the nozzle of the 3/8”
reducer (35294) back and forth be-
tween the workpiece and the weld rod
in a pendulum motion, while applying
a slight, downward force on the weld
rod. Heat both the rod and the work-
piece evenly.
Start by cutting a pointed tip onto one
end of the weld rod. Place the pointed
tip onto the workpiece while holding
the rod in a vertical position. Once the fusion process has begun (slight puddling
of weld where the pointed tip is located), slowly begin to angle the rod as shown
while maintaining downward pressure on the weld rod. Allow rod to cool for ap-
prox. 5 minutes before trimming end of rod.
Weld Shoe 35269: For best results, allow the
weld shoe to heat for approx. 2 minutes. Set the
PH-1400A to 1000°F and airow of 7. Set the
PH-1200A to a temperature of 6 LEDs and an
airow of 3 LEDs. Test on the plastic workpiece
and adjust the temperature as needed.
Wire Mesh Screen 35698: Used for reinforcing
and strengthening weld repairs. For best results,
sink into the plastic workpiece until covered with
plastic. Smooth the plastic evenly over the mesh
with the welding shoe.Optional: use weld rod or
ber-ex to add extra ller material over the top
of the wire mesh.

Master Appliance Corp.
2420 18th Street
Racine, WI 53403-2381
USA (EEUU)
58398-W Rev A
Phone / Téléphone / Teléfono:
[phone]
Fax / Téléc. : [phone]
[e-mail]
www.masterappliance.com
Fiber-Flex Rod 35697: For use with welding shoe 35269. Not recommended for
use with speed-weld tip as rod is slightly rubbery and tends to clog the speed-
weld tip. Set the PH-1400A to an initial temperature of 900°F and set the air ow
at 5. Set the PH-1200A to an initial temperature of 5 LEDs and set the air ow
at 4 LEDs. Allow the weld shoe to heat for approx. 2 minutes. Do not attempt to
melt the base material together with the ber-ex. Fiber-ex repair is similar to
brazing.
Fiber-ex is a hot-melt adhesive with special additives to allow it to adhere
to multiple thermoplastics and TPO materials, and to give it slight elasticity.
Glass-lling is also added to give it strength. It does not fusion weld to the base
plastic; instead, it adheres to the surface.
Prep the workpiece by removing the shiny outer surface with 50-grit or courser
sandpaper or low-speed grinder. The rough surface will give the ber-ex adhe-
sive many, small hills and valleys to adhere to, effectively increasing the surface
area for adhesion. Apply ber-ex rod in layers at a thickness of approx. 1/16”
for each layer, smoothing over the top of each layer until your desired thickness
is achieved. After cooling, the ber-ex can be sanded with progressively ner
grit until the desired surface nish is achieved.