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Welding

All about welding, arranged by
TÜV SÜD Industrie Service GmbH and our Partner AIR LIQUIDE Deutschland GmbH

Welding bases
Operational requirements
Personnel qualification
Approval of welding procedures
Schweißen hochfester Stähle
Schweißgase (Systematik)
Schweißen hochlegierter Stähle
Schweißzusatzwerkstoffe
Preheating temperature
Arbeitshilfen, Tipps und Tricks
Welding methods
Welding methods

Welding methods

Welding can be defined as an assembly of two or more parts of the same or a different materials by means of heat or pressure with or without the use of a filler material. The most widely used metal welding processes are classified as: pressure welding and fusion welding.


Name

protective gas, inert gas

Materials /
Terms of use

   MAG welding (metal arc gas welding)

 

MAG welding

 

The most commonly used arc-welding technique for sheet metal welding, mainly of steel. Typical applications include bicycle frames and automobil repair. The wire electrode serves both as filler material and as arc electrode. The molten material is protected from oxygen by chemical reactions between an active gas, like CO2, and additives in the wire electrode.

    Ar / O2
    Ar / CO2
    Ar / CO2 / O2
    Ar / CO2 / O2 /
    He

    Steel

 

MIG welding (metal inert gas welding)

 

An arc-welding technique for welding metals like aluminium and stainless steel. The wire electrode serves both as filler material and as arc electrode. The molten material is protected from oxygen by an inactive gas like argon or helium.

    Ar
    He

     Stainless steel
     Aluminium (Al)
     Titanium (Ti)

 

TIG welding (tungsten inert gas welding)

 

TIG welding or Gas Tungsten Arc Welding (GTAW) or wolfram inert gas (WIG) welding, refers to the nonconsumable electrode, an alloy of 98% W (tungsten) and 2% Th (thorium), is. Filler material, if required, is added separately to the weld pool.

    Ar
    He
    Ar / He-Mixture

    all





    Stick welding, electrode welding

 
    Shielded Metal Arc Welding (SMAW) is frequently referred to as stick or covered electrode welding.
    Stick welding is among the most widely used welding processes.
    The flux covering the electrode melts during welding.
    This forms the gas and slag to shield the arc and molten weld pool.
    The slag must be chipped off the weld bead after welding.
    The flux also provides a method of adding scavengers, deoxidizers, and alloying elements to the weld metal.




For further information please contact
TÜV SÜD Industrie Service
Welding joints
Welding joints

Welding joints

The area where the two pieces are to be weld together is called the welding joint. There are several kinds of welding joints depending on the arrangement of the work pieces.



Butt joint

Lap joint

Parall joint

Single T-joint

Double T-joint

Angle joint

Corner joint

Multiple joint



For further information please contact
TÜV SÜD Industrie Service
Welds
Welds

Welds

Weld seams join the parts at the welding joint.

Flanged butt weld

I-weld

V-weld

double V-weld
(X-weld)

Y-weld

U-weld

Fillet weld

double Fillet weld



For further information please contact
TÜV SÜD Industrie Service
Post weld heat treatment 
Post weld heat treatment 

Post weld heat treatment 

Wärmenachbehandlung nach dem Schweißen

Die Notwendigkeit und die Art der Wärmebehandlung nach dem Schweißen ergeben sich in Abhängigkeit von der chemischen Zusammensetzung der Werkstoffe und Schweißzusätze, der Form des Bauteils, der Wanddicke, den Schweißbedingungen, den Festigkeitseigenschaften, dem Umfang der zerstörungsfreien Prüfung und, soweit notwendig, von der Einhaltung zusätzlicher Bedingungen. Ist eine Wärmebehandlung nach dem Schweißen erforderlich, genügt hierfür in der Regel ein Spannungsarm- oder Anlaßglühen.

Die Wärmebehandlungstemperatur und -dauer sind werkstoff- und bauteilbedingt. Die Angaben darüber sind im allgemeinen den Werkstoffspezifikationen wie z.B. Normen, VdTÜV-Kennblättern, Werkstoffblättern zu entnehmen. Abhängig von Werkstoff, Wanddicke und Bauteilabmessungen sind auch die Wärme- und Abkühlungsgeschwindigkeit zu wählen


For further information please contact
TÜV SÜD Industrie Service