Clarke ARC Specifiche Scaricare il pdf (Pagina 20)

Scratch the tip of the electrode on soon as an arc develops, quickly withdraw

the electrode to maintain a gap of approx. 3-4 mm, and proceed to weld.

(See notes below).

To stop welding, simply remove the torch from the workpiece.

This method is referred to as ‘Scratch Arc’.

REMEMBER to turn OFF the gas immediately you finish welding.

NOTE: To avoid a visible strike mark on the surface of the workpiece, it is

advisable to strike the arc in the joint, where the mark will be

concealed by the weld.

NOTE: Thin sheet and stainless steel may be welded with or without filler,

similar to gas welding.

NOTE: The filler is fed in at the edge of the pool. The rod must not touch

the tip of the electrode or enter the arc. The end of the rod must

always be shielded by the argon atmosphere to prevent as far as

possible the formation of oxides of its surface. When welding

stainless steel and copper, it is often possible to feed in the filler

continuously at the edge of the pool.

NOTE: The arc length generally varies between 3 and 6mm depending

on the type of joint, type and thickness of material, and so on.

NOTE: The torch is advanced in the direction of welding, without lateral

movement, maintaining the torch angle of 45

to the workpiece.

Guidelines for the TIG welding current needed and recommended electrode

sizes etc. for different gauges of material are shown in the chart below:

Always ensure that the gas is turned OFF at the cylinder after use.

Metal

Welding

Current

(Amps)

Workpiece

Thickness

(mm)

Filler Rod

Dia (mm)

Welding

Electrode

Dia (mm)

Gas Flow

ltr/min

Mild Steel 30 1 0-2 1.6 4

70 2 2.0 1.6 4

115 3 2.4 2.4 4.3

125 3.5 2.4 2.4 4.6

Stainless

Steel

35 1 0-2 1.6 4

80 2 2.4 2.4 4.3

125 3 2.4 2.4 4.6

Copper 80 2 2.4 2.4 5

125 3 3.2 2.4 5

1 2 ... 15 16 17 18 19 20 21 22 23 24 25 26 27 28

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