Page 6 - SSAB Welding Handbook Edition 2

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1.0 Index Welding handbook

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9.0 Hardox and Strenx shop primers 14.0 Avoidance of discontinuities in the joint
9.1 Welding of shop primed plates 55 14.1 Lack of root penetration 82
9.2 Thermal cutting of shop primer painted plate 56 Description of lack of root penetration 82
9.3 Health aspects 56 Acceptance criteria according to ISO 5817 83
14.2 Lack of fusion 84
Description of lack of fusion 84
10.0 Joint preparations Acceptance criteria according to EN ISO 5817 84
10.0 Joint preparations 57 14.3 Solidification cracks (Hot cracks) 85
Description of solidification cracks 85
Acceptance criteria according to ISO 5817 86
11.0 Cutting of Hardox and Strenx 14.4 Slag formation 87
Description of slag formation 87
11.1 Oxy-fuel cutting 59 Acceptance criteria according to ISO 5817 88
11.2 Plasma cutting 59 14.5 Undercuts 89
11.3 Laser cutting 60 Description of undercuts 89
Laser cutting of primed plates 60
Acceptance criteria according to ISO 5817
11.4 Hydrogen cracks 60 14.6 Crater pipes 89
90
The influence from alloy elements in the steel 61 Description of crater pipes 90
Tensile stresses due to cutting 61 Acceptance criteria according to ISO 5817 90
Tensile stresses due to global stress field 62 14.7 Porosity 91
Measures to avoid hydrogen cracking 62 Description of porosity 91
Preheating 63 Acceptance criteria according to ISO 5817 92
Postheating 64 14.8 Spatter 92
Reduced cutting speed 66 Description of spatter 92
Slow cooling 66 Acceptance criteria according to ISO 5817 92
11.5 Hardness properties in HAZ 66
Reducing the risk of softening 66
Cutting of small parts 67 15.0 Magnetic arc blow
11.6 Submerged cutting 67
11.7 Plate handling 67 15.1 Residual magnetism in steels 94
15.2 The appearance of the joint 94
15.3 Welding with multiple arcs 94
12.0 The use of shielding gas 15.4 Measures to counteract magnetic arc blow 95
The angle of the torch 95
12.1 MAG welding 69 Welding sequences 95
Arc types for MAG welding 69 Welding with A.C. 95
Shielding gases for MAG welding 71 Workpiece connections 96
Argon 72 Welding joints of larger plate thicknesses 96
Carbon dioxide 72 Demagnetizing equipment 96
Selection of shielding gas for MAG welding 73 The selection of welding parameters 97
12.2 Shielding gas for TIG welding 73 Measures for multiple arc welding 97
12.3 General grouping of suitable shielding gases
in MAG and TIG welding of Hardox and Strenx 73
12.4 Gas flow during MAG and TIG welding of 16.0 Post-weld heat treatment
Hardox and Strenx 74
16.1 Aspects regarding welding processes 100
16.2 Suitable consumables for welding of structures
that are subjected to a PWHT 100
13.0 Distortions in joints
16.3 Other types of requirements 100
13.1 Mechanisms behind the formation of distortions 75
Appearance of the joint geometry 76
The effect of heat input 76
Placement of the joint 77
The influence of external joint restraint 77
Welding towards sections of lower constriction 78
Presetting of the joint 78
The use of back step or skip welding techniques 79
Software for analyses of distortions 79
Straightening of distortions 79
6 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.
It is the responsibility of the user of this brochure to adapt the recommendations contained therein to the requirements of individual applications.