WARPP INARC 200 IDS, Руководство по эксплуатации

Страница: 12 / 19

●
In the welding process, the arc must not be too long; otherwise, it will cause unstable arc burning,
large spatter, light penetration, undercut, blowhole, etc. if the arc is too short, it will cause electrode stick.
●
In MMA welding the arc length is usually equal to 0.5
– 1.0 time of the electrode diameter. The basic
electrode
’s arc length is not beyond the electrode diameter, it is better to choose the short arc welding;
the acid electrode
’s arc length is equal to the electrode diameter.
§
4.5 Arc Welding Defect and Prevent Method
Defect mane Caused reasons Prevent methods
Welding seam does not meet the
requirement
The groove angle is not
proper
The root face and assembly
gap is not equal.
Welding techniques
parameters are unreasonable
The welder
’s operation skill is
lower
Choosing the proper groove angle &
assembly gap, improve the assembly
quality
Choosing the proper welding
parameters
Improve the operation skill of welders
Undercut Over current
Arc length is too long
The electrode angle is wrong
Manipulation of electrode is
not proper
Choosing the proper welding current &
speed
The arc cannot be drawn too long
The electrode angle should be proper
Manipulation of electrode should be
correct
Incomplete penetration The groove angle or gas is too
small, the root face is too big
Welding parameters are not
suitable, or the assembly is
not good
The welder
’s operation skill is
lower
Correctly to choose and process the
groove size
Correctly to assemble and ensure
clearance
Choosing the suitable welding current
& speed
Improve the operation skill of welders
Incomplete fusion The welding thermal input is
too low
The arc direction is lean
There are rust & dust on the
side of groove
The slag between the layers is
not cleared well
Correctly to choose the welding
parameters
Operation seriously
Enhance the clearness of layers
Overlap The temperature of molten
pool is too high
The liquid metal concretes
slowly
Choosing parameters based on the
welding different position
Strictly to control the molten hole size
Crater The crater time lasts too short
Over current in the welding of
thin plate
In the crater, electrode should be
stayed for a short time or round to
manipulate electrode after the molten
pool is filled in by metal, take to the
side for crater