1. Microstructure and properties of high strength weld metals
Lars-Erik Svensson
Volvo Powertrain
Lars-Erik Svensson Sheet & Screw Joint Technologies

2. Background Review Discussion
Lars-Erik Svensson Sheet & Screw Joint Technologies

3. Applications of high strength steels
Background Review Discussion
Applications of high strength steels
Lars-Erik Svensson Sheet & Screw Joint Technologies

4. Background Review Discussion
Lars-Erik Svensson Sheet & Screw Joint Technologies

5. Background Review Discussion
Lars-Erik Svensson Sheet & Screw Joint Technologies

6. Background Review Discussion
Lars-Erik Svensson Sheet & Screw Joint Technologies

7. Background Review Discussion
Lars-Erik Svensson Sheet & Screw Joint Technologies

8. Background Review Discussion
Lars-Erik Svensson Sheet & Screw Joint Technologies

9. Complications Background Review Discussion
Keehan: Manual Metal Arc, ISO-procedure, cooling time 10 s
Banguru et al: MIG/MAG, girth weld procedure, cooling time 5 s
Lars-Erik Svensson Sheet & Screw Joint Technologies

10. Background Review Discussion
Yield and tensile strength vs Pcm - parameter
Lars-Erik Svensson Sheet & Screw Joint Technologies

11. Hardenability Background Review Discussion
Pcm = C + Si/30 + (Mn + Cu + Cr)/20 + Ni/60 + Mo/15 + V/10 + 5B
Hardenability
Lars-Erik Svensson Sheet & Screw Joint Technologies

12. Background Review Discussion
Yield and tensile strength vs Pcm – parameter (Fairchild, Banguru et al)
Lars-Erik Svensson Sheet & Screw Joint Technologies

13. Background Review Discussion
Impact toughness vs Pcm – parameter
Lars-Erik Svensson Sheet & Screw Joint Technologies

14. Microstructure Background Review Discussion Esab OK 75.78: bainite
Low Mn, low Ni: allotriomorphic ferrite
High Mn, medium Ni: acicular ferrite + martensite (+ bainite)
Low Mn, high Ni: acicular ferrite, martensite, ferrite side plates (?)/bainite
High Mn, high Ni: bainite + martensite
Lars-Erik Svensson Sheet & Screw Joint Technologies

15. Microstructure Background Review Discussion
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16. Banguru et al Background Review Discussion
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17. Keehan Background Review Discussion OK 75.78 0.5 Mn – 7 Ni 2 Mn – 7 Ni
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18. Tensile strength: Impact toughness: Background Review Discussion
based on Pcm comparison – good correlation
based on microstructure: weld metals containing ”softer” constituents (AF) give higher strength ??
Impact toughness:
AF-containing weld metals generally higher impact toughness
more difficult property to compare
Lars-Erik Svensson Sheet & Screw Joint Technologies

19. Lower yield strength at higher Pcm
Background Review Discussion
Lower yield strength at higher Pcm
Need to understand plastic deformation of bainitic/martensitic microstructures
Lars-Erik Svensson Sheet & Screw Joint Technologies

20. Development of microstructure: Significant differences
Background Review Discussion
Development of microstructure: Significant differences
Banguru et al: ”active” particles (Ti, Zr)
Keehan: role of coalesced bainite
Lars-Erik Svensson Sheet & Screw Joint Technologies

21. Background Review Discussion
Lars-Erik Svensson Sheet & Screw Joint Technologies

22. Successful development of high strength weld metals
Background Review Discussion
Successful development of high strength weld metals
Lars-Erik Svensson Sheet & Screw Joint Technologies

23. Successful development of high strength weld metals
Background Review Discussion
Successful development of high strength weld metals
Lars-Erik Svensson Sheet & Screw Joint Technologies