Residual stress in laser welded dissimilar steel tube-to-tube joints

Journal Article · Wed Sep 01 00:00:00 EDT 1993 · Scripta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-716X(93)90409-L· OSTI ID:6327382

Sun, Zheng ^[1]

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1. Technical Research Centre of Finland, Espoo (Finland). Lab. of Production Engineering

Austenitic-ferritic dissimilar steel joints are widely used in power generation systems. Their utilization has proved to be efficient in terms of satisfactory properties and the economics. These types of joints have usually been produced using conventional welding processes, such as tungsten inert gas (TIG) welding. With the rapid development of high power lasers, laser welding has received considerable attention. Laser welding offers many advantages over conventional welding processes, e.g. low heat input, small heat-affected zone (HAZ), small distortion, and welding in an exact and reproducible manner. Residual stress distribution in laser welds may also differ from those made by conventional welding processes due to its special features. Residual stress, particularly tensile residual stress in the weld, can be very important factor in controlling the quality and service life of the welded structure. The formation of tensile residual stress in the weld may result in the initiation of fatigue cracking, stress corrosion cracking or other types of fractures. It is useful, therefore, to understand the distribution of residual stress in austenitic-ferritic laser welds, and thus evaluate the quality of the joints. Although residual stress distribution in the welded joints has been extensively investigated, little data are available for the residual stress distribution in laser welds. The aim of the work was to examine residual stress distribution along laser welds of dissimilar steel tube-to-tube joints, which were made by both autogeneous welding and welding with filler wire. The results were also compared with the joints made by plasma arc and TIG welding.

• OSTI ID: 6327382
• Journal Information: Scripta Metallurgica et Materialia; (United States), Vol. 29:5; ISSN 0956-716X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
LOW ALLOY STEELS
LASER WELDING
STAINLESS STEELS
WELDED JOINTS
RESIDUAL STRESSES
CRACK PROPAGATION
EXPERIMENTAL DATA
FATIGUE
FILLER METALS
HEAT AFFECTED ZONE
POWER PLANTS
SPATIAL DISTRIBUTION
STRESS CORROSION
TENSILE PROPERTIES
TUBES
ALLOYS
CHEMICAL REACTIONS
CORROSION
DATA
DISTRIBUTION
FABRICATION
HIGH ALLOY STEELS
INFORMATION
IRON ALLOYS
IRON BASE ALLOYS
JOINING
JOINTS
MECHANICAL PROPERTIES
NUMERICAL DATA
STEELS
STRESSES
WELDING
ZONES
360103* - Metals & Alloys- Mechanical Properties