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8

copper, making preheating of heavy sections necessary to give 
proper fusion of weld and base metal.

Types of electrodes

Arc welding electrodes are classified into a number of groups 

depending on their applications. There are a great number of 
electrodes used for specialized industrial purposes which are not of 
particular interest for everyday general work. These include some 
low hydrogen types for high tensile steel, cellulose types for welding 
large diameter pipes, etc. The range of electrodes dealt with in this 
publication will cover the vast majority of applications likely to be 
encountered; are all easy to use and all will work on even the most 
basic of welding machines.

Metals being joined & electrode comments

Mild steel  

6013 ideal electrodes for all general purpose work. Features include 
outstanding operator appeal, easy arc starting and low spatter.

Cast iron 

99% nickel suitable for joining all cast irons except white cast iron

Stainless steel 

318l-16 high corrosion resistance. Ideal for dairy work, etc. on 
stainless steels.

6.0 Operation

WarnInG

When using an open arc process, it is necessary to use correct 
eye, head, and body protection.

6.1 MMa Welding Guide

Effects of MMA welding various materials

High tensile and alloy steels

The two most prominent effects of welding these steels are the 
formation of a hardened zone in the weld area, and, if suitable 
precautions are not taken, the occurrence in this zone of under-bead 
cracks. Hardened zone and under-bead cracks in the weld area may 
be reduced by using the correct electrodes, preheating, using higher 
current settings, using larger electrodes sizes, short runs for larger 
electrode deposits or tempering in a furnace.

Manganese steels

The effect on manganese steel of slow cooling from high 
temperatures is enbrittlement. For this reason it is absolutely 
essential to keep manganese steel cool during welding by quenching 
after each weld or skip welding to distribute the heat.

Cast iron

Most types of cast iron, except white iron, are weldable. White iron, 
because of its extreme brittleness, generally cracks when attempts 
are made to weld it. Trouble may also be experienced when welding 
white-heart malleable, due to the porosity caused by gas held in this 
type of iron.

Copper and alloys

The most important factor is the high rate of heat conductivity of 

6.2 Basic tIG Welding Guide

TIG welding cable connection

Connect the TIG torch to the - terminal and the work return lead 
to the + terminal for direct current straight polarity. Direct current 
straight polarity is the most widely used polarity for DC TIG welding. 
It allows limited wear of the electrode since 70% of the heat is 
concentrated at the work piece. Connect the gas hose on the TIG 
torch to the gas outlet. Move the selector switch on the front panel of 
the machine to the LIFT-TIG position. 

Torch starting in Lift TIG mode

Ensure the gas supply is switched on to the machine. Briefly contact 

the tip of the tungsten electrode down onto the work piece with the 
torch at around 70

0

 from vertical. Depress the trigger to start the gas 

flow and switch on the power, lift the torch up from the work piece 

to draw out an arc. To prevent melting of the end of the tungsten the 
machine will increase the output current when it detects the rise in 
arc voltage as the tungsten is lifted from the work piece. At the end 
of the weld release the torch trigger and the power will slope down 
and switch off.

Torch starting in HF mode

Ensure the gas supply is switched on to the machine. Hold the torch 
with the tip of the tungsten approx 2-3 mm from the job. Depress the 

trigger to start the gas flow and switch on the power. At the end of 

the weld release the torch trigger and the power will slope down and 
switch off.

TIG welding guide ranges

Electrode diameter 

AC current 

(amps)

DC current 

(amps)

0.040” (1.0mm) 

15-30

20-60

1/16” (1.6mm) 

60-120

75-150

3/32” (2.4mm) 

100-180

150-250

Tungsten electrode types

Type

Application

Colour

Thoriated 2%

DC welding of mild 
steel, 

Stainless steel and 
Copper

Red

O

pera

t

IO

n

O

pera

t

IO

n

Содержание XTT 202P

Страница 1: ...OperatOr Manual ISSue 8 XTT 202P AC DC...

Страница 2: ...maintenance this equipment should provide years of reliable service All our systems conform to ISO9001 2015 and are independently audited by NQA The entire product range carries the CE mark and is con...

Страница 3: ...urn Lead Connection 7 5 7 Liquid Cooling 7 6 0 Operation 7 6 1 MMA Welding Guide 8 6 2 Basic TIG Welding Guide 8 6 3 Machine Setup for TIG Welding 9 6 3 1 DC TIG Welding no Pulse 9 6 3 2 AC TIG Weldin...

Страница 4: ...health FuMeS anD GaSeS can be hazardous Keep your head out of the fumes Do not breathe the fumes If inside ventilate the area and or use local forced ventilation at the arc to remove welding fumes an...

Страница 5: ...and cables as far away from your body as possible nOISe can damage hearing Noise from some processes or equipment can damage hearing Wear approved ear protection if noise level is high Shielding gas...

Страница 6: ...to the fault finding section for further information 6 Gas Output connection This is a 3 8 BSP connection for the gas output connection to the welding torch TIG welding 7 negative connection This is u...

Страница 7: ...ch one of the electrical input voltages shown on the input data label on the unit nameplate The XTT 202P AC DC machine should only be used on 230V supply Refer to the specifications table for voltage...

Страница 8: ...weld or skip welding to distribute the heat Cast iron Most types of cast iron except white iron are weldable White iron because of its extreme brittleness generally cracks when attempts are made to w...

Страница 9: ...position E 8 Adjust the parameter value by rotating the knob F This can be adjusted from 0 1 to 1 0 seconds The value is displayed on the Multifunction display G 9 Press the toggle button D to move t...

Страница 10: ...with pulse Function It is possible to use the pulse function with both AC and DC TIG welding Power Pulsing can give significant advantages on thinner material to control heat and penetration 1 Follow...

Страница 11: ...base setting 30 40Hz will help agitate the weld puddle and allow you to weld at a lower amperage than without pulse 50 150Hz really stiffen the arc and let you pinpoint the arc more than without pulse...

Страница 12: ...electrodes used on heavy cold plate b Welding current is too low c Wrong electrode angle d Travel speed of electrode is too high e Scale or dirt on joint surface a Use larger electrodes and preheat t...

Страница 13: ...line for gas flow problems Description possible Cause Remedy Arc flutters during TIG welding a Tungsten electrode is too large for the welding current b Absence of oxides in the Weld pool a Select th...

Страница 14: ...to the machine and re start c Have a qualified service engineer inspect then repair the welder rOutIne MaIntenanCe The only routine maintenance required for the power supply is a thorough cleaning and...

Страница 15: ...et Fitted with 5 8 BSP inlet connections Stock Code Description Maximum Outlet Pressure E700140 Argon Preset Regulator 3 0 Bar E700141 Argon Indicator Regulator 3 0 Bar E700113 1 Gauge Argon 30 lpm fl...

Страница 16: ...O26 and PRO26FX Air Cooled Pro Grip TIG Welding Torch Rating 200A DC 150A AC 60 Duty Cycle EN60974 7 020 to 5 32 0 5mm 4 0mm Electrodes B 2 3 11 12 13 4 5 10 9 7 6 8 14 15 16 C D E A 1 18 17 1 A F G H...

Страница 17: ...Description H 45V29 Gas Lens Body 020 0 5mm Bore 45V24 Gas Lens Body 040 1 0mm Bore 45V25 Gas Lens Body 1 16 1 6mm Bore 45V26 Gas Lens Body 3 32 2 4mm Bore 45V27 Gas Lens Body 1 8 3 2mm Bore Standard...

Страница 18: ...SE The above listed products are certified to be compliant with the RoHS directive with all homogeneous component parts being controlled to ensure material contents as per the list below Cadmium 0 01...

Страница 19: ...f the product determined by Parweld to be defective Parweld makes no other warranty express or implied This warranty is exclusive and in lieu of all others including but not limited to any warranty of...

Страница 20: ...Parweld Limited Bewdley Business Park Long Bank Bewdley Worcestershire England DY12 2TZ tel 44 1299 266800 fax 44 1299 266900 www parweld co uk info parweld co uk...

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