Tweco ArcMaster 401S Manuel d'utilisateur télécharger pdf (Page 53)

ARCMASTER 401S POWER SOURCE

Manual 0-5345 4-15 BASIC WELDING GUIDE

FAULT CAUSE REMEDY

6 Electrode melts or oxidizes

when an arc is struck.

A Torch lead connected

to positive welding

terminal.

A Connect torch lead to negative welding

terminal.

B No gas ﬂowing to

welding region.

B Check the gas lines for kinks or breaks

and gas cylinder contents.

C Torch is clogged with

dust or dirt.

C Clean torch.

D Gas hose is cut. D Replace gas hose.

E Gas passage contains

impurities.

E Disconnect gas hose from the rear of

Power Source then raise gas pressure

and blow out impurities.

F Gas regulator turned

off.

F Turn on.

G The electrode is too

small for the welding

current.

G Increase electrode diameter or reduce

the welding current.

H Power source is set for

STICK welding.

H Set Power Source to a GTAW operating

mode.

7 Dirty weld pool A Electrode contami-

nated by contact with

work piece or ﬁller rod

material.

A Clean the electrode by grinding off the

contaminates.

B Work piece surface has

foreign material on it.

B Clean surface.

C Gas contaminated with

air.

C Check gas lines for cuts and loose ﬁtting

or change gas cylinder.

8 Poor weld ﬁnish Inadequate shielding

gas.

Increase gas ﬂow or check gas line for

gas ﬂow problems.

9 Arc start is not smooth. A Tungsten electrode is

too large for the weld-

ing current.

A Select the right size tungsten electrode.

Refer to Table 4-3 Tweco Tungsten Elec-

trode Selection Chart.

B The wrong electrode

is being used for the

welding job.

B Select the right tungsten electrode type.

C Gas ﬂow rate is too

high.

C Select the right rate for the welding job.

Refer to Table 4-6.

D Incorrect shielding gas

is being used.

D Select the right shielding gas.

E Poor work clamp con-

nection to work piece.

E Improve connection to work piece.

10 Arc ﬂutters during TIG

welding.

Tungsten electrode is

too large for the weld-

ing current.

Select the right size tungsten electrode.

Table 4-7

1 2 ... 48 49 50 51 52 53 54 55 56 57 58 ... 63 64

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