Y-groove weld cracking test

To make clear the effect of weld thermal cycles during repair welding on the hydrogen content and weld cold cracking at the interface in the structural material of petroleum pressure vessels, the crack susceptibility was estimated by y groove weld cracking test with varying overlay thickness and hydrogen exposure conditions. During the y groove selfrestraint cracking test, reheat cracking occurred only in the bismuthcontaining weld metal at temperaturs above 823k during heating or holding. Underbead cracking, a typical form of hydrogen induced cracking, was observed in the hardened region of the heat affected zone of ferritic welds where the heat input was 0. Journal of biomimetics, biomaterials and biomedical engineering materials science. Cold cracking susceptibility of austenitic and martensitic. The test weld shall be laid into the y groove as a single bead using an electrode of 4 mm diameter.

In order to obtain a high ferrite 85% level in y groove test runs, two panel assemblies were buttered with the high ferrite consumable prior to. Based on this viewpoint, the above effect was examined by y groove restraint cracking test. This standard applies primarily but not exclusively to cmn and low alloy steels. Cruciform test controlled thermal severity cts test lehigh restraint test implant test 16. Evaluation of hydrogeninduced cracking in highstrength. In this paper, a series of theoretical analyses are performed for restraint stressstrain produced in the weld metal of the oblique y groove weld cracking test specimen, varying the kind of steel, heat input, preheating temperature and the base plate thickness. Effect of martensite on cold cracking in 600mpa grade fluxcored. Tekken y groove or lehigh ugroove test in order to obtain information about the cold cracking sensitivity during welding. Then, the mechanical characteristics of this specimen are clarified. Test plates were machined in accordance with jis standard z3158 1993 12. The work detailed in this paper was performed to determine the likelihood of cracking during and after welding of 10 mm thick, high hardness, armour steel plate in conditions of high restraint.

High restraint conditions were tested using the y groove test. The y groove weld cracking test is widely used to investigate the necessary preheat temperature to avoid cold cracking 38. This type of damage is also produced during casting. C yurioka, kasuya quarterly journal of japan welding society,vol. Cold cracks in the weld metal were measured using the ygroove test, and four different preheating temperatures were employed from room temperature to 150 c. This wire was made on an experimental basis to be applied to 980 mpa grade steel without preheating. Welds were performed with ferritic, austenitic and duplex austenitic ferritic electrodes. In this study, the occurrence of cold cracking in high strength steel welds were investigated in terms of residual stress and hydrogen diffusion behavior. Y groove cracking test was conducted to study the welding crack resistance of nm400 steel. In order to confirm the weldability, y groove weld cracking tests were conducted in conformity to jis z 3158. All three of these cracking phenomena have been observed in austenitic stainless steels and nibase. Investigation of hydrogen assisted crack in welding by. Evaluation of hydrogenassisted cracking susceptibility in. Hot cracking tests an overview of present technologies.

The invention discloses a test weld gap clearance ensuring method in an oblique y groove weld cracking test method and a test plate, belonging to the technical field of welding. Us4091147a welded steel products having low sensitivity. In this study, the effect of lowtemperature transformation expansion on the residual stress reduction of welds with different restraint factors in cold cracking test specimens was examined by. Jfetecs staff, with its abundant experience in diverse types of tests and experiments, provides solutions from drafting of experiment plans and preparation of test specimens to actual evaluation testing utilizing the testing machines. In this study, to examine the validity of the crack initiation criterion derived from ae measurements during the ssrt tests, y groove weld cracking tests were conducted under various preheat temperatures and diffusible. The y groove weld cracking test is widely used to investigate the necessary preheat temperature to avoid cold cracking. Postheating includes postweld heat treatment pwht, immediate postweld heating ipwh, normalizing, quenching, and. Weld performance evaluation jfe technoresearch corporation. Recent developments in weldability testing for advanced. Second, to improve their weldability, the proper preheating temperature was determined using y groove cracking test and mechanical property tests. Hydrogen cracking of ferriticaustenitic stainless steel.

Assessment of welding crack resistance of steel nm400 consists of the surface crack rate, section crack. Investigation of hydrogen assisted crack in welding by using y. Jis31582016method of y groove weld cracking test foreign standard. Postheating can be defined as the application of heat to an assembly after welding. Download scientific diagram a dimension in mm of ygroove weld cracking test joint, and b experimental photo of ae measurement. The single run tests were based on the y groove approach, to induce weld metal cracking as encountered in practice. As already mentioned, straight y groove tests are suitable to reveal susceptibility of the weld metal for cracking while the other one for haz cracking. Understanding weld symbols the groove weld meyer tool. The weld cracking susceptibility of high hardness armour. Since local stress is one of the most important factors for. Weld performance evaluation for performance evaluation of welds joints, joint parts, leave it to jfetec. The hydrogenassisted cracking susceptibility of modified 9cr1mo steel weld is evaluated by y groove and gapped beadonplate test.

The y groove weld cracking test of ts780mpa grade steel plate was conducted with intentionally introducing hydrogen into the shielding gas during the gasmetal arc welding gmaw. With the increase of preheating temperature, the crack rate of the test joint of xiaotieyan test piece is significantly reduced. Cold cracks in the weld metal were measured using the ygroove test, and four different preheating temperatures were employed from room. Penetrant indication after y groove weld cracking test welding conditions jisz3158 y groove weld cracking test welding process. Finally, a semiautomatic co 2 welding method was adopted, and a second mechanical property test was conducted to determine the proper welding wire. Results of y groove weld cracking test on jfehiten 780le. A chart method to determine necessary preheat temperature.

The test condition and the test results are shown in table 3. If testing is required, a number of options are available. Effect of preheating on welding cold crack sensitivity of. Experiences with haz cold cracking tests on a cmn structural steel. Quarterly journal of the japan welding society steel. Defines the method of y groove weld cracking test for examining the likelihood of occurrence of cold cracks in the welds of steel made by means of manual metalarc welding or gasshielded metalarc welding, and also for examining appropriate preheating temperatures for preventing such cold cracks. It suggested that in order to decrease the tendency of welding cracking, the clam steel should be preheated over. Ygroove cracking test on the welding crack resistance of. Using manual metal arc welding process and tekken test y grove test has been car ried out both. A tekken or y groove test is a highly restrained buttweld test for haz heataffected zone hydrogen cracking.

Repair weldability at overlaybase metal interface of. International journal of engineering science and technology vol. Citeseerx the weld cracking susceptibility of high. A weld groove is defined as a channel in the surface of a workpiece or an opening. This standard covers the common tests for the mechanical testing of welds. All welding was performed using the pulsed gas metal arc welding process in the flat position. Weld cracking and mechanical properties of 17% chromium. Investigation of hydrogen assisted crack in welding by using y groove test j. Ppt seamless flux cored wire powerpoint presentation. The reheat cracking sensitivity was increased with increasing bismuth content in the weld metal. In all the specimens tested, including inclined y groove specimens, cracking was confined to weld metal indicating.

Critical conditions of cold cracking in high strength. In this study, to examine the validity of the crack initiation. Jfe steel corporation plates high tensile strength. The welding was conducted at the condition of 260 a26 v23 cmmin with no preheating. A groove weld is defined in the american welding society aws aws a3. Testing of cold crack susceptibility of weld and heataffected zone in the root pass weld. In an external weld cracking test, however, stress intensity continues to increase and the. Since no single universally accepted test is available to characterise cold cracking, the panel tentatively recom mended that a test procedure for y groove weld crackability test based on the japanese standard jis z 31581966 diagonal ytype weld crack testing methods shall be formulated.