Used Robots.com: Motoman XRC Arc Welding

Created: 99-02-16   Revised: 99-08-18 Operator's manual MOTOMAN XRC Page: 85 MOTOMAN ROBOTICS EUROPE 4. Adjustments for welding defects To adjust welding conditions after welding, look at the appearance of the welding
bead. Welding defect Reason for occurrence Correction method Pore:
Generic name of defect
caused by the influence of
H₂, N₂, CO₂, and Ar. Pits
and blowholes, etc. may
exist. Shortage of shield gas flow
rate Spatter adheres to nozzle Influence of wind Adhesion of rust and oil to
surface Paint adhesion Welding current, voltage,
and welding speed are
incorrect Torch angle and wire length
are incorrect With no influence from the wind, and
when the torch angle and wire length
are correct, 15-30 l/min is assumed to
be the suitable shield gas rate.
Change the gas flow rate according to
the workpiece construction condition. Remove the spatter frequently and
thoroughly.
Choose the best welding condition and
spatter will be prevented from occur-
ring frequentl y.
Adjusting the torch angle and nozzle
height will also reduce the amount of
spatter. Close the shutte r, door, and window.
Avoid using a fan during welding.
Use a screen. Remove rust and oil with thinne  r,
brush, and grinde r, etc. Remove paint using thinne  r. Define the proper voltage range.
Adjust the voltage in accordance with
the arc length. Make the torch angle smalle  r.
Set the wire length in accordance with
the welding condition. Undercut:
Defect name for when the
groove is not completely
filled along the toe of the
weld. Excessive welding current
Incorrect welding voltage
Excessive welding speed
Unsuitable torch angle and
aim position Lower the welding current and speed.
Adjust the voltage. Adjust the torch angle and aim posi-
tion. Pit
Blowhole Undercut


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