Consumables General Powerpoint

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Copyright 2002 TWI Ltd

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All those things used up in the production of a weld

Though generally, we refer to those elements that are used in

a specific welding process i.e:

Electrodes, Wires, Fluxes and Gases*


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In MMA/SMA the only consuma!les used are short

electrodes, which are co"ered in a flu# coating.

This flu# coating has many functions and there are

many different types

These functions are not limited to, but include:

1 To aid arc stri!ing

" To stabili#e the arc

$ Form a shielding gas

% To add de&oxidants

' To add allo(ing elements

) To form a protectie slag

+ To refine solidif(ing metal

To control h(drogen content *


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$

-lassification: .ain

-onstituent:

/hielding

gas:

General

0ses:

utile: E)21$ Titania

Ti3"

-3" General4urpose

5asic: E+21 -alciumcompounds

-3" 6igh 7ualit(wor!

-ellulosic: E )212 -elluloseGround cocoanut shells

6(drogen 4ipe rootruns*

The core wire for most ..A electrodes is of a low 7ualit( steel, as this is a cheap

method of manufacture and the steel will be refined during the process of welding

b( the refining agents and elements contained in the flux coating*


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1: &lectrode si'e

2: &lectrode condition

$: &lectrode specification

(iameter ) length*

*rac+s, chips ) concentricity*

*orrect specification/code*

E '1 $$ 5

1$.%


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&lectrode

Tensile ) yield strength

Toughness 2 ) % 0oules

lu# coating type

&lectrode efficiency

ositional capa!ilities

&lectrical parameters

3ow hydrogen potential

4After !a+ing5

& -1$$6

/trengthToughness-oating Shown on all electrodes*


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lu# coating type

Toughness % 0oules

&lectrode

Tensile ) yield strength

Any light alloying composition&lectrical parameters ) efficiency

3ow hydrogen content achie"a!le*

E %) $18i 5

/trengthToughness-oating Shown on all electrodes*


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&lectrode

Tensile strength

4SI #15


lu# coating )

electrical characteristics*

E2 1


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8ases used for .9G: Argon or 6elium or Ar6e mixture

-3": 9ery good penetration, cannot support spray transfer

produces an unsta!le arc, with lots of spatter

Argon:Shallow penetration. 9ery sta!le arc, with low spatter

e mi# !oth gases in mi#ture of !etween ' ; "2 -3"in

argon to get the !enefits of !oth gases*

or stainless steels we use argon with a "


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8ases used for T9G:

Argon or 6elium ora mi#ture of these gases*


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ires must !e drawn as deposited and are therefore of "ery high

>uality. &lectrode wires for MI8 are the same as rods for TI8*

Grades:-omposition =Single, dou!le, and triple de=o#idised wires*

>ualit( of winding:?andom wound. 3ayer wound. ) recision layer wound

Wires diameters:.7 = @2.% mm supplied on 1 +g 4fine wire5 ) 1- +g spools*

The >uality of temper and copper coating is also "ery important.

The copper coating on MI8 wires ma#imises the current pic+ up*

Specifications for wires are as per their chemical compositions

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