Part No. 729-110-040 Rev. 1.41 | June 2016
© 2016 Nelson Stud Welding, Inc. All Rights Reserved.
7
SAFETY SYMBOLS
ATTENTION!
BE ALERT!
WELDING CAN BE HARMFUL
TO YOURSELF AND OTHERS.
Used to call attention to immediate
hazards which, if not avoided, will
result in immediate, serious personal
injury or loss of life.
Used to call attention to potential
hazards which could result in personal
injury or loss of life.
Used to call attention to hazards
which could result in minor personal
injury.
1
Introduction
The following procedure contains instructions for operating and servicing the N550c Arc Charger welding unit.
1.1
Unit Description
The Nelweld N550c Arc Charger is a compact and portable power unit that welds studs onto workpiece
surfaces designed for the construction, industrial and shipbuilding industries.
The Arc Charger works as a constant current switch mode power source using extremely short weld times and
is capable of welding studs with up to a 3/8” (9.5 mm) diameter weld base.
1.2
Welding Method
The Arc Charger is a stud welding system designed to use both the drawn arc and short cycle weld process.
The drawn arc method utilizes fasteners with integrated flux balls in conjunction with ceramic ferrules. The flux
ball on the tip of the stud acts as a deoxidizing agent during the weld. The ceramic ferrule contains the molten
metal in a consistent shape around the weld.
The short cycle method utilizes fasteners without a flux ball and does not require a ceramic ferrule. With the
exception of shorter weld time, the operational sequence is identical to the drawn arc method.
The extremely short weld times of the Short-Cycle method allows studs to be welded without ceramic ferrules.
To protect the weld pool, especially with aluminum welds, it is advisable to use inert gas. The introduced inert
gas displaces the air from the welding zone. If studs are welded under inert gas, a tapered welding tip is
preferred. The tranquil arc plunge dampener option should not be used with this process.
Summary of Contents for ArcCharger N550C DOMESTIC
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