voestalpine bohler welding TERRA NX 320 SMC Classic Manual De Instrucciones página 77

» Incorrect welding mode.
» Pieces to be welded have different characteristics.
Cold cracks
Cause
» Humidity in the filler metal.
» Particular geometry of the joint to be welded.
10. OPERATING INSTRUCTIONS
10.1 Manual Metal Arc welding (MMA)
Preparing the edges
Choosing the electrode
Type of coating
Acid
Basic
Choosing the welding current
Striking and maintaining the arc
Removing the slag
» Carry out the correct sequence of operations for the type of joint to
be welded.
»
Solution
» Always use quality materials and products.
» Keep the filler metal always in perfect condition.
» Pre-heat the workpieces to be welded.
» Carry out post-heating.
» Carry out the correct sequence of operations for the type of joint to
be welded.
Property
Carrying out the welding
centre.
73
OPERATING INSTRUCTIONS
Use
EN