11.0 POSSIBLE WELDING DEFECTS
DEFECT
POROSITY
CRACKS
LIMITED
PENETRATION
HIGH SPRAYS
PROFILE DEFECTS
ARC INSTABILITY
ELECTRODE MELTS
OBLIQUELY
12.0 TROUBLE SHOOTING
INCONVENIENCE
SPARK WILL NOT
START
NO OUTPUT VOL-
TAGE
WRONG OUTPUT
CURRENT
CAUSES
Acid electrode on steel with high
VXOSKXU FRQWHQW
(OHFWURGH RVFLOODWHV WRR PXFK
:RUNSLHFHV DUH WRR IDU DSDUW
:RUNSLHFH EHLQJ ZHOGHG LV FROG
0DWHULDO WR EH ZHOGHG LV GLUW\ HJ
RLO SDLQWV UXVW R[LGHV
1RW HQRXJK FXUUHQW
/RZ FXUUHQW
+LJK ZHOGLQJ UDWH
5HYHUVHG SRODULW\
Electrode inclined in position
RSSRVLWH WR LWV PRYHPHQW
(OHFWURGH LV WRR LQFOLQHG
:HOGLQJ SDUDPHWHUV DUH LQFRUUHFW
Pass rate is not related to opera-
WLQJ SDUDPHWHUV UHTXLUHPHQWV
1RW HQRXJK FXUUHQW
(OHFWURGH FRUH LV QRW FHQWUHG
0DJQHWLF EORZ SKHQRPHQRQ
CAUSE
%DG SULPDU\ FRQQHFWLRQ
,QYHUWHU 3&% LV GHIHFWLYH
Overheated unit, yellow LED lit
Overvoltage protection interven-
WLRQ JUHHQ /(' RII
Overcurrent protection interven-
WLRQ \HOORZ /(' OLW
,QWHUQDO UHOD\ KDV IDLOHG
,QYHUWHU 3&% LV GHIHFWLYH
'HIHFWLYH FRQWURO SRWHQWLRPHWHU
Low primary power supply
YROWDJH
SUGGESTIONS
8VH EDVLF HOHFWURGHV
Move edges to be welded closer
WRJHWKHU
0RYH VORZO\ DW WKH EHJLQQLQJ
/RZHU ZHOGLQJ FXUUHQW
Cleaning workpieces before
welding is an essential method of
DFKLHYLQJ QHDW ZHOG EHDGV
Make sure operating parameters
are regulated and improve prepa-
UDWLRQ RI ZRUNSLHFHV
0DNH DSSURSULDWH FRUUHFWLRQV
Follow basic and general welding
SULQFLSOHV
Check condition of electrode and
HDUWK ZLUH FRQQHFWLRQ
5HSODFH HOHFWURGH
Connect two earth wires to opposi-
WH VLGHV RI WKH ZRUNSLHFH
REMEDY
&KHFN SULPDU\ FRQQHFWLRQ
&RQWDFW DIWHU VDOHV VHUYLFH FHQWUH
:DLW IRU WKHUPDO FXWRXW WR EH UHVHW
&KHFN SRZHU OLQH 5HVHW WKH XQLW
E\ WXUQLQJ LW RII DQG RQ DIWHU
VHFRQGV
Reset the unit by turning it off and
RQ DIWHU VHFRQGV ,I WKH XQLW GR-
esn't revert working contact after
VDOHV VHUYLFH FHQWUH
&RQWDFW DIWHU VDOHV VHUYLFH FHQWUH
&RQWDFW DIWHU VDOHV VHUYLFH FHQWUH
&RQWDFW DIWHU VDOHV VHUYLFH FHQWUH
&KHFN SRZHU OLQH
11