Page 73 - SSAB Welding Handbook Edition 2

©2009-2019 by SSAB Group of companies (SSAB). All rights reserved. Only digital PDF file. No distribution. No printing allowed!
No part of this handbook may be reproduced in any form or by any means without permission in writing from SSAB.
Welding handbook 12.0 The use of shielding gas

Ar + Ar + Ar + Ar +
2% CO 2 5% CO 2 10% CO 2 20% CO 2 100% CO 2

Fig. 12.8: Schematic penetration profiles when varying the composition of the shielding gas during MAG welding.

Welding method Arc type Position Shielding gas [weight %]

MAG, solid wire Short arc All positions 18-25% CO , rest Ar
2
MAG, cored wire Short arc All positions 18-25% CO , rest Ar
2
MAG, solid wire Spray arc Horizontal (PA, PB, PC) 15-20% CO , rest Ar
2
MAG, MCAW Spray arc All positions 15-20% CO , rest Ar
2
MAG, MCAW ©SSAB 15-20% CO , rest Ar
Horizontal (PA, PB, PC)
Spray arc
2
Robotic and automatic Mag Spray arc Horizontal (PA, PB, PC) 8-18% CO , rest Ar
2
TIG Spray Arc All positions 100% Ar
Table 12.1: Suggestions of different gas mixtures for welding the Hardox and Strenx grades.

Selection of shielding gas for MAG welding parent metal and the tungsten electrode from
oxidation. Furthermore, it should allow for a stable
Due to the influence of the shielding gas, the final arc to be established. In general, SSAB proposes a
welding performance is a combination of the shielding gas composition of pure argon for TIG
properties from each individual gas component. An welding which fulfills these requirements.
increased fraction of a gas component leads to a
greater influence of the characteristics for that specific
gas. The typical penetration profiles for different gas
mixtures are illustrated below in fig. 12.8. for the 12.3 General grouping of suitable
welding of fillet joints. shielding gases in MAG and TIG
welding of Hardox and Strenx
General proposals for shielding compositions are
according to the table 12.1. The shielding gases proposed in table 12.1 for MAG
and TIG welding of Hardox and Strenx are well
balanced in order to support a high quality welding
12.2 Shielding gas for TIG welding performance. If Hardox and Strenx grades are
welded to other types of steel the same gas types may
The shielding gas mixture for TIG welding is easier be applied.
to decide since there are fewer options compared to
MAG welding. During TIG welding, a gas should be
used to protect the weld pool, its immidiate adjecent

This handbook contains general suggestions and information without any expressed or implied warranty of any kind. SSAB hereby expressly disclaims
all liability of any kind, including any damages, in connection with the use of the information and for their suitability for individual applications. 73
It is the responsibility of the user of this brochure to adapt the recommendations contained therein to the requirements of individual applications.