Hitachi EW2800 [11/44] Possible welding defects

Hitachi EW2800 [11/44] Possible welding defects
11
11.0 POSSIBLE WELDING DEFECTS
DEFECT CAUSES SUGGESTIONS
POROSITY Acid electrode on steel with high

&
./
./!
6
Move edges to be welded closer

7!
!!
CRACKS 7!1
3

Cleaning workpieces before
welding is an essential method of
!
LIMITED
PENETRATION
!
9!
$
Electrode inclined in position

Make sure operating parameters
are regulated and improve prepa-
!/
HIGH SPRAYS & 7/
PROFILE DEFECTS .
Pass rate is not related to opera-

Follow basic and general welding

ARC INSTABILITY  Check condition of electrode and
!
ELECTRODE MELTS
OBLIQUELY
&
7!
$
Connect two earth wires to opposi-
!/
INCONVENIENCE CAUSE REMEDY
SPARK WILL NOT
START
2
'X2
X/
X
NO OUTPUT VOL-
TAGE
Overheated unit, yellow LED lit
Overvoltage protection interven-
&4
Overcurrent protection interven-
!&4
'
'X2
.<
X/!$
@

Reset the unit by turning it off and
@'-
esn’t revert working contact after

X
X
WRONG OUTPUT
CURRENT
4
Low primary power supply

X
X/!
12.0 TROUBLE SHOOTING

Содержание

Похожие устройства

11 0 POSSIBLE WELDING DEFECTS DEFECT POROSITY CAUSES Acid electrode on steel with high sulphur content Electrode oscillates too much ARC INSTABILITY Workpieces are too far apart Workpiece being welded is cold Material to be welded is dirty e g oil paints rust oxides Not enough current Low current High welding rate Reversed polarity Electrode inclined in position opposite to its movement Electrode is too inclined Welding parameters are incorrect Pass rate is not related to opera ting parameters requirements Not enough current ELECTRODE MELTS OBLIQUELY Electrode core is not centred Magnetic blow phenomenon CRACKS LIMITED PENETRATION HIGH SPRAYS PROFILE DEFECTS SUGGESTIONS Use basic electrodes Move edges to be welded closer together Move slowly at the beginning Lower welding current Cleaning workpieces before welding is an essential method of achieving neat weld beads Make sure operating parameters are regulated and improve prepa ration of workpieces Make appropriate corrections Follow basic and general welding principles Check condition of electrode and earth wire connection Replace electrode Connect two earth wires to opposi te sides of the workpiece 12 0 TROUBLE SHOOTING INCONVENIENCE SPARK WILL NOT START NO OUTPUT VOL TAGE CAUSE Bad primary connection Inverter PCB is defective Overheated unit yellow LED lit Overvoltage protection interven tion green LED off Overcurrent protection interven tion yellow LED lit WRONG OUTPUT CURRENT Internal relay has failed Inverter PCB is defective Defective control potentiometer Low primary power supply voltage REMEDY Check primary connection Contact after sales service centre Wait for thermal cut out to be reset Check power line Reset the unit by turning it off and on after 20 seconds Reset the unit by turning it off and on after 20 seconds If the unit do esn t revert working contact after sales service centre Contact after sales service centre Contact after sales service centre Contact after sales service centre Check power line 11

Скачать