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BMH-22i
3.2
Stud welding
The PH-5L stud welding gun with control cable and shielding gas equipment is the standard gun to be
connected to the BMH-22i stud welder. These operating instructions only refer to the BMH-22i stud
welder.
For information regarding the stud welding guns to be used and their adjustment, please refer to the
respective operating instructions.
3.2.1
Drawn arc welding with shielding gas
With this method, a gas mixture containing 82% of Argon and 18% of CO
auxiliary aid.
This shielding gas protects the welding point from the atmosphere and simultaneously supports the
weld pool. Moreover, it ensures a concave fillet weld upset formation with a blank metallic surface,
thus reducing the risk of corrosion and obtaining an improved dynamic behaviour of the welded joint.
An accurate bulging, to scale or in a calibrated or reproducible type, is not possible when welding with
shielding gas without using any auxiliary aid. Stud welding with shielding gas can be carried out at
much shorter intervals as no ceramic ferrules have to be fitted and removed in each welding process.
*) Corgon®18 is a gas mixture of Linde AG in D-82049 Höllriegelskreuth
R
3.2.2
Drawn arc welding with ceramic ferrules
The ceramic ferrule fulfils the following functions:
• It centres the electric arc.
• It protects the welding point from the atmosphere.
• It ensures the exact formation of the weld upset.
• It prevents too rapid cooling of the weld pool.
• It partially protects against spraying sparks.
To ensure a perfect and accurate weld upset, each stud requires a ceramic ferrule matching its
diameter and shape. After every welding process, the ceramic ferrule must be knocked down and
replaced by a new one.
Usually this method allows you to weld in any position.
IMPORTANT INFORMATION
Ensure ceramic ferrules are absolutely dry.
3.3
Manual electric welding / TIG welding
Instructions on application:
These operating instructions only describe the function "stud welding".
Instructions on manual electric welding / TIG welding can be obtained from the respective
manufacturers of the necessary accessories.
is used as
(e.g. Corgon®18*)
2
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