Tweco ArcMaster 401MST Bedienungsanleitung PDF herunterladen (Seite 67)

ARCMASTER 401MST POWER SOURCE

Manual 0-5287 4-11 BASIC WELDING GUIDE

4 A groove has been

formed in the base

metal adjacent to

the toe of a weld

and has not been

ﬁlled by the weld

metal (undercut).

A Welding current is too

high.

A Reduce welding current.

B Welding arc is too long. B Reduce the length of the welding arc.

C Angle of the electrode is

incorrect.

C Electrode should not be inclined less than 45° to

the vertical face.

D Joint preparation does not

allow correct electrode

angle.

D Allow more room in joint for manipulation of the

electrode.

E Electrode too large for

joint.

E Use smaller gauge electrode.

F Insufﬁcient deposit time at

edge of weave.

F Pause for a moment at edge of weave to allow

weld metal buildup.

5 Portions of the

weld bead do not

fuse to the surface

of the metal or

edge of the joint.

A Small electrodes used on

heavy cold plate.

A Use larger electrodes and preheat the plate.

B Welding current is too low. B Increase welding current.

C Wrong electrode angle. C Adjust angle so the welding arc is directed more

into the base metal.

D Travel speed of electrode

is too high.

D Reduce travel speed of electrode.

E Scale or dirt on joint

surface.

E Clean surface before welding.

Art: A-04972

Figure 2: Example of Lack of Fusion

6 Gas pockets or

voids in weld

metal (porosity)

A High levels of sulphur in

steel.

A Use an electrode that is designed for high sul-

phur steels.

B Electrodes are damp. B Dry electrodes before use.

C Welding current is too

high.

C Reduce welding current.

D Surface impurities such as

oil, grease, paint, etc.

D Clean joint before welding.

E Welding in a windy envi-

ronment.

E Shield the weld area from the wind.

F Electrode damaged ie ﬂux

coating incomplete.

F Discard damaged electrodes and only use elec-

trodes with a complete ﬂux coating.

1 2 ... 62 63 64 65 66 67 68 69 70 71 72 ... 83 84

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