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Analysis of the process of qualifying the welding technology of S355JR structural steel using the submerged arc welding method

Wieczorska A., Labuda W.

Journal of Achievements in Materials and Manufacturing Engineering

2023

Vol. 118, nr 1

18--27

Purpose This paper presents the issue of welding technology qualification using the example of structural steel S355JR with a plate thickness of 25 mm and 100 mm, bevelling ½V. The main objective of this work was to attempt to perform a full qualification of the submerged arc welding process in accordance with the requirements of PN EN ISO 15614. Particular attention was paid to the issue of the qualification of welding technology. The samples were subjected to non-destructive testing, i.e. visual and penetrant testing, as well as ultrasonic testing and heat treatment. This was followed by destructive testing, including macroscopic testing and hardness testing. According to the proposed procedure for the recognition of submerged arc welding technology, once the necessary tests had been carried out and the protocols with positive results had been obtained. The documentation had been completed, the analysis needed to obtain certificates of conformity for factory production control and welding quality was carried out. Design/methodology/approach Submerged arc welding is often used for highly responsible butt joints, particularly when joining thick components. This has been achieved through the proper design of the preparation of the parts to be welded and the development of a welding technology that practically eliminates the pre-phase that occurs in traditional technology, thereby eliminating the risk of it affecting the quality of the welded joint. Findings During the implementation of submerged arc welding, a number of technological problems were encountered. The first test joints contained many defects, i.e. sticking and slag inclusions inside the welds. In addition, obtaining welds with the correct profile and removing the slag from the weld groove was difficult. These obstacles were eliminated experimentally by carrying out successive tests using different parameters and welding groove geometries. Practical implications The correct implementation of any welding process depends on its input parameters. These parameters include welding current, welding speed, welding current, wire diameter, welding voltage and many others. Submerged arc welding (SAW) is widely used in the industry for manufacturing as it is more reliable, provides deep penetration in the work, ensures a smooth finish on objects, and results in high productivity. Originality/value The technology was developed for a company that manufactures control discs for steam turbines.

The influence of cooling rate during welding on joint properties made of austenitic steel 1.4301

Rzeźnikiewicz Agnieszka, Makielak Mateusz, Dyner Piotr

Welding Technology Review

2019

R. 91, nr 11

43--49

The aim of the research was to investigated the influence of cooling rate during welding on joint properties made of austenitic steel 1.4301. Three test panels were made: cooled in air, cooled by dipping the plate in water and cooled by spraying water from the side of the weld ridge. Non-destructive examinations (visual, penetrative and radiographic) and destructive tests (stretching, bending and impact tests) were made on the test panels. In addition, the ferrite content measurement was carried out. It has been shown that the cooling affects the ferrite content and the impact strength of the joint.

W pracy zbadano wpływ szybkości chłodzenia podczas spawania na własności złącza wykonanego ze stali austenitycznej 1.4301. Wykonano trzy płyty próbne: chłodzoną w powietrzu, chłodzoną poprzez zanurzenie płyty w wodzie oraz chłodzoną poprzez natrysk wody od strony grani. Na płytach próbnych wykonano badania nieniszczące (wizualne, penetracyjne oraz radiograficzne) oraz niszczące (rozciągania, zginania oraz badania udarności). Dodatkowo wykonano pomiar zawartości ferrytu. Wykazano, że szybkość chłodzenia ma wpływ na poziom zawartości ferrytu oraz na udarność złącza.