Butt welding

About: Butt welding is a research topic. Over the lifetime, 7153 publications have been published within this topic receiving 44467 citations.

Verification of Validity and Generality of Dominant Factors in High Accuracy Prediction of Welding Distortion

Abstract: The two dominant factors, satisfying the yield condition (especially at high temperature above 700 °C) and regarding the weld metal shape as the deposited metal, in the high accuracy prediction of welding distortion had been previously determined using a bead-on-plate specimen with a groove. To verify the validity of the dominant factors, the experiment and thermal elastic-plastic analysis by FEM were conducted using a specimen for butt welding and fillet welding. The validity of the dominant factors in the high accuracy prediction of welding distortion using the bead-on-plate specimen with the groove was verified by the results of butt welding and fillet welding, and its generality was confirmed. It was confirmed that residual stress was also accurately predicted because welding distortion was accurately predicted.

Fatigue performance of butt welds between cast steel joint and steel tubular members

Abstract: Cast steel joints have gained increasing popularity for use in engineering. The fatigue performance of butt welds between cast steel joint and steel tubular members, however, is not yet well characterized. A series of fatigue tests were conducted on a new type of welding detail, cast steel joint with sloped end and integrated backing ring (Type C), for butt welds between cast steel joint and steel tubular members. Fatigue failure mechanism and S–N curves obtained from the tests were compared with those of Type A connection with backing ring and Type B cast steel joint with integrated nose obtained in literature. Fatigue behaviours of all three welding details were successfully predicted by local strain approach, the results of which are consistent with test results, especially for Types A and B welding details. According to the results of tests and analysis, fatigue cracking of butt welds between cast steel joint and steel tubular members always initiates from the bottom of the weld root, and the fatigue performance of Type C welding detail is better than those of Types A and B because of its lower stress concentration level. A simplified fatigue design equation was then proposed based on the results of local strain approach, in which the fatigue notch factor was adopted in fatigue behaviour evaluation. The accuracy of this simplified fatigue design equation was verified for Type C welding details with various geometry configurations.

Welded joint and a method of making same

Abstract: This invention relates to a method of preparing the edges of metallic bodies to form a welding groove and welding the prepared edges together to produce unitary metallic bodies. The method is particularly applicable to butt weld-. ing the edge faces of thick metals by fusion welding. In welding...

Some studies on mechanical properties of friction stir butt welded Al-6082-T6 plates

Abstract: The conventional fusion welding of cast aluminium alloys is generally difficult due to some common defects such as porosity, oxide inclusion, and hot cracking, which in turn reduce the weld strength. In recent years, friction stir welding (FSW) was found to be very effective for the welding of various wrought aluminum alloys. This paper investigates a metal joining process called Friction Stir Welding (FSW), an innovative welding technique invented by TWI Ltd. in Great Britain in 1991. The purpose of the paper is to study the effects of process parameters in the butt welding of Al-6082-T6 plates with a thickness of 3 mm. Joints were made using different combinations of tool rotation speed, welding speed, and axial force, each at different levels. The quality of weld zone was analyzed using macrostructure. The study aims in identifying the process parameters of welding the Al6082 alloy and the effect of welding speed on the weld performance of the joint was investigated by conducting tensile and hardness tests.

Verification of validity and generality of dominant factors in high accurate prediction of welding distortion

Abstract: When out-of-plane distortion was measured objecting to butt welding, if tack welding was easily performed, the position of a neutral axis was variously changed by the linear misalignment. Out-of-plane distortion was generated in the unexpected direction because the neutral axis changed. From such as bitter experience, a test specimen to measure out-of-plane distortion was proposed so as to solve this problem. Using the proposed specimen, out-of-plane distortion was measured for butt welding.In the high accurate prediction of welding distortion, the dominant factors, which were satisfying the yield condition (especially at high temperature above 700 degree Celsius) and regarding the weld metal as welds, had been specified in fillet welding previously. So as to verify the validity of the dominant factors, the experiment and thermal elastic plastic analysis by FEM were carried out using newly developed specimen for butt welding. The validity of the dominant factors in the high accurate prediction of welding distortion objecting to fillet welding was verified by the results of butt welding and its generality was confirmed. It was confirmed that residual stress was also highly predicted because welding distortion was highly predicted.