![background image](http://html1.mh-extra.com/html/pro-point/8619470/8619470_operating-manual_1607430034.webp)
34
Electrode Included Angle/Taper - DC Welding
Tungsten electrodes for DC welding should be ground longitudinally and concentrically with diamond wheels to a
specific included angle in conjunction with the tip/flat preparation. Different angles produce different arc shapes and
offer different weld penetration capabilities. In general, blunter electrodes that have a larger included angle provide
the following benefits:
• Last Longer
• Have better weld penetration
• Have a narrower arc shape
• Can handle more amperage without eroding.
Sharper electrodes with smaller included angle provide:
• Offer less arc weld
• Have a wider arc
• Have a more consistent arc
The included angle determines weld bead shape and size. Generally, as the included angle increases, penetration
increases and bead width decreases.
Tungsten Preparation
Always use
DIAMOND
wheels when grinding and cutting. While tungsten is a very hard material, the surface of a
diamond wheel is harder, and this makes for smooth grinding. Grinding without diamond wheels, such as aluminium
oxide wheels, can lead to jagged edges, imperfections, or poor surface finishes not visible to the eye that will contrib-
ute to weld inconsistency and weld defects.
Always ensure to grind the tungsten in a longitudinal direction on the grinding wheel. Tungsten electrodes are manu-
factured with the molecular structure of the grain running lengthwise and thus grinding crosswise is “grinding against
the grain.” If electrodes are ground crosswise, the electrons have to jump across the grinding marks and the arc can
start before the tip and wander. Grinding longitudinally with the grain, the electrons flow steadily and easily to the end
of the tungsten tip. The arc starts straight and remains narrow, concentrated, and stable.
grind longitudinal on the
grinding wheel
don’t grind across
the grinding whee
l
flat tip
2.5 times tungsten diameter
pointed tip
Electrode Tip/Flat
The shape of the tungsten electrode tip is an important process variable in precision arc welding. A good selection
of tip/flat size will balance the need for several advantages. The bigger the flat, the more likely arc wander will occur
and the more difficult it will be to arc start. However, increasing the flat to the maximum level that still allows arc start
and eliminates arc wonder will improve the weld penetration and increase the electrode life. Some welders still grind
electrodes to a sharp point, which makes arc starting easier. However, they risk decreased welding performance from
melting at the tip and the possibility of the point falling off into the weld pool.
flat spot diameter
included angle
Tungsten
Diameter at
Constant Included
Current Range
Current Range
Diameter
the Tip - mm
Angle - Degrees
Amps
Pulsed Amps
3/64” (0.040”)
.250
20
05 - 30
05 - 60
1/16” (.062” & .060”)
.500
25
08 - 50
05 - 100
1/16” (.062” & .060”)
.800
30
10 - 70
10 - 140
3/32” (.93”)
.800
35
12 - 90
12 - 180
3/32” (.93”)
1.100
45
15 - 150
15 - 250
1/8” (.125”)
1.100
60
20 - 200
20 - 300
1/8” (.125”)
1.500
90
25 - 250
25 - 350
These parts are manufactured in China and are offered as
replacement parts suitable for “TWECO” style torches.
Rating: 200A CO2 150A mixed gas, EN60974-7 @ 60% duty cycle. 0.6 to 1.2mm / 0.025” to 0.045
47/34” wires
TWC2 STYLE MIG TORCH
Description
1
Adjustable
Nozzle
Insulator
2
TW
No.2
Metal
Jacket
Neck
Assembly
45
Degreet
Neck
Assembly
60
Degreet Neck
Assembly
3
Block
C/W
Spacer
&
Screws
4
Control
Wire
Terminals
5
Hose
Clamp
18.5mm
/
(47/64)
6
Spring Cable Support Small & Ball Joint
7
Hyperflex
C/Assy X 10ft Euro
Hyperflex
C/Assy X 12ft Euro
Hyperflex
C/Assy X 15ft Euro
Hyperflex
C/Assy X 10ft
Hyperflex
C/Assy X 12ft
Hyperflex
C/Assy X 15ft
8
Handle
With Hook & Screw
Description
9
Grey Trigger Switch
10
Hanger Hook
11
Screw Kit
112 Cable Terminal Male
13
Cable End Lock Nut (M12 X 1.0)
14
Cable Support
15
Gun Plug Housing C/W Nut
16
Gun Plug Screw
17
Gun Plug Nut
18
Gun Plug Terminal Female
19
TWC Euro Gun Plug Body
20
Gun Plug ‘O’ Ring
21
Liner Retaining Nut
*
Wear parts next page
*
Wear parts next page
1
2
3
5
6
14
12
13
18
15
16
17
19
20
21
8
7
9
10
11
4
Torch Model
Description
Part Number
15ft
Welding Torch c/w Euro Fitting
TWC2-15FTE
TWC2 Air Cooled Mig Welding Torch
Rating: 200A CO2 150A mixed gas, EN60974-7 @ 60% duty cycle. 0.6 to 1.2mm / 0.023” to 0.047” wires
TWC2 STYLE MIG TORCH
Spare Parts
Part Number
Description
1
PWGA32
Adjustable Nozzle Insulator
2
U62J60
TW No.2 Metal Jacket Neck Assembly
WGA62A-45
45 Degreet Neck Assembly
WGA62A-60
60 DegreetNeck Assembly
3
U102
Block C/W Spacer & Screws
4
U244T
Control Wire Terminals
5
UB5044
Hose Clamp 18.5mm / 0.728”
6
U141-6S
Spring Cable Support Small & Ball Joint
7
U200-10E
Hyperflex C/Assy X 10ft Euro
U200-12E
Hyperflex C/Assy X 12ft Euro
U200-15E
Hyperflex C/Assy X 15ft Euro
Part Number
Description
9
U92
Grey Trigger Switch
10
U152
Hanger Hook
11
U122FMS
Screw Kit
112 UB1522
Cable Terminal Male
13
UXL1542
Cable End Lock Nut (M12 X 1.0)
14
UPA2041
Cable Support
15
UB1518
Gun Plug Housing C/W Nut
16
UB1526
Gun Plug Screw
17
UB1519/S
Gun Plug Nut
18
UB1523
Gun Plug Terminal Female
19
U174EX-1
TWC Euro Gun Plug Body
Содержание 8619470
Страница 48: ...48 NOTES ...
Страница 49: ...49 NOTES ...
Страница 50: ...50 PRINCESS AUTO LTD Phone 1 800 665 8685 WWW PRINCESSAUTO COM MADE IN CHINA ...