Učinak postupka platiranja na mehanička svojstva toplinski obrađenog raznovrsnog spoja

The specimens plated by different cladding procedures (hot rolling, submerged arc welding surfacing using strip electrode (SAW) and explosion welding) were heat treated by annealing (650 ºC through 2 hours). Charpy impact energy testing, as well as shear strength testing of clad joints were performed. Testing results indicated significance of cladding procedure and determined heat treatment infl uences on stated mechanical properties.Uzorci platirani različitim postupcima platiranja (toplim valjanjem, elektrolučnim postupkom navarivanja pod prahom elektrodnom trakom (EPP) i eksplozijskim zavarivanjem) toplinski su obrađivani žarenjem (650 ºC tijekom 2 sata). Provedena su ispitivanja Charpy udarne radnje loma kao i smične čvrstoće platiranog spoja. Rezultati ispitivanja utvrđuju značajnost utjecaja postupka platiranja i toplinske obradbe na navedena mehanička svojstva

Utjecaj toplinske obradbe na pretvorbu delta-ferita u zavarima austenitnih nerđajućih čelika

Shielded metal arc (SMAW) welded specimens using austenitic consumable materials with different amount of delta-ferrite are annealed in range 650-750 °C through 2-10 hours. Factorial plan 33 with influenced factors regression analyze of measured delta-ferrite values is used. The transformation i.e. decomposition of delta ferrite during annealing was analyzed regarding on weld cracking resistance using metallographic examination and WRC-1992 diagram.Ručno elektrolučno(REL) zavareni uzorci uporabom austenitnog korozijski postojanog dodatnog materijala s različitim udjelima delta ferita, žareni su u području 650-750 °C tijekom 2-10 sati.Korišten je faktorski plan 33 sa regresijskom analizom utjecajnih čimbenika mjerenih vrijednosti delta ferita. Pretvorba odnosno raspad delta ferita za vrijeme žarenja analizirana je s obzirom na otpornost zavara pukotinama metalografski i uporabom WRC-1992 dijagrama

Utjecaj toplinske obradbe na pretvorbu delta-ferita u zavarima austenitnih nerđajućih čelika

Shielded metal arc (SMAW) welded specimens using austenitic consumable materials with different amount of delta-ferrite are annealed in range 650-750 °C through 2-10 hours. Factorial plan 33 with influenced factors regression analyze of measured delta-ferrite values is used. The transformation i.e. decomposition of delta ferrite during annealing was analyzed regarding on weld cracking resistance using metallographic examination and WRC-1992 diagram.Ručno elektrolučno(REL) zavareni uzorci uporabom austenitnog korozijski postojanog dodatnog materijala s različitim udjelima delta ferita, žareni su u području 650-750 °C tijekom 2-10 sati.Korišten je faktorski plan 33 sa regresijskom analizom utjecajnih čimbenika mjerenih vrijednosti delta ferita. Pretvorba odnosno raspad delta ferita za vrijeme žarenja analizirana je s obzirom na otpornost zavara pukotinama metalografski i uporabom WRC-1992 dijagrama

Učinak postupka platiranja na mehanička svojstva toplinski obrađenog raznovrsnog spoja

The specimens plated by different cladding procedures (hot rolling, submerged arc welding surfacing using strip electrode (SAW) and explosion welding) were heat treated by annealing (650 ºC through 2 hours). Charpy impact energy testing, as well as shear strength testing of clad joints were performed. Testing results indicated significance of cladding procedure and determined heat treatment infl uences on stated mechanical properties.Uzorci platirani različitim postupcima platiranja (toplim valjanjem, elektrolučnim postupkom navarivanja pod prahom elektrodnom trakom (EPP) i eksplozijskim zavarivanjem) toplinski su obrađivani žarenjem (650 ºC tijekom 2 sata). Provedena su ispitivanja Charpy udarne radnje loma kao i smične čvrstoće platiranog spoja. Rezultati ispitivanja utvrđuju značajnost utjecaja postupka platiranja i toplinske obradbe na navedena mehanička svojstva

Utjecaj toplinske obradbe na svojstva eksplozijski spojenog trosloja: AlMg-Al-čelik

The procedure of welding by explosion is as technical optimal solution of ship-shell parts joining frequently used in shipbuilding industry at transition three-metal joint: AlMg4.5-Al-St.52-3 working out. The investigations of mechanical and metallographic properties of joints, exposed on heat treatment at different temperatures levels, are performed. The results of mechanical and metallographic examinations of transition joints at elevated temperatures, direct on its use below 300 °C. The additional melting welding working out is in closeness of explosion- welded joint allowed.Postupak spajanja eksplozijom često je u uporabi u brodograđevnoj industriji pri izradbi prijelaznog trosloja: AlMg5-Al-St.52-3 kao tehnički optimalnog rješenja pri spajanju trupa i nadgrađa broda. Provedena su ispitivanja mehaničkih i metalografskih svojstava spojeva izloženih toplinskoj obradbi na različitim temperaturama. Rezultati upućuju na znatnu otpornost spoja pri izlaganju temperaturama do 300 °C, a što dopušta daljnje izvođenje zavarivanja taljenjem u neposrednoj blizini eksplozijskog spoja

Effect of solution annealing on properties of used reformer centrifugally casted tubes prior to repair by welding

The specimens of damaged tubes, ASTM A297 HK 40, are repaired by welding. Before repairing, solution annealing is used as a procedure for properties restitution. This paper explores the influence of used solution annealing procedure (1 050 şC / 2h) on mechanical and micro-structural properties. The emphasis is put on specific procedures at repair by welding

Effect of cladding procedures on mechanical properties of heat treated dissimilar joint

The specimens plated by different cladding procedures (hot rolling, submerged arc welding surfacing using strip electrode (SAW) and explosion welding) were heat treated by annealing (650 ºC through 2 hours). Charpy impact energy testing, as well as shear strength testing of clad joints were performed. Testing results indicated significance of cladding procedure and determined heat treatment infl uences on stated mechanical properties

Strukturna analiza eksplozijski spojenog trosloja: cirkonij-titan-čelik

The influence of applied explosion joining parameters on the structure and strength of three-metal joints: Zr-Ti-Steel is analyzed in this paper. Zirconium was explosively clad on steel over an inter-layer of titanium. Zirconium-titanium-steel joint is produced during simultaneous cladding operation using a single cladding shot and plan parallel joining scheme. The metallographic analysis of interfaces Zr/Ti and Ti/Steel structures and microhardness measuring are performed. Mechanical testing of bond strength is performed on both interfaces by shear strength examinations.U radu je analiziran utjecaj primijenjenih parametara spajanja eksplozijom na strukturu i čvrstoću troslojnog spoja: Cirkonij/Titan/Čelik. Čelik je eksplozijski platiran cirkonijem preko međusloja titana. Troslojni spoj: Zr/Ti/Čelik, proizveden je istovremenim postupkom platiranja- uporabom jedne detonacije i plan-paralelne sheme spajanja. Provedena je metalografska analiza struktura graničnih površina Cirkonij /Titan i Titan/Čelik, te mjerenje mikrotvrdoća. Čvrstoća spoja na obje granične površine je utvrđivana mjerenjem smičnih čvrstoća

The influence of heat treatment by annealing on clad plates residual stresses

The influence of applied clad procedure as well as heat treatment by annealing (650 °C/2h) on level and nature of residual stresses was researched. Three clad procedures are used i.e. hot rolling, submerged arc welding (SAW) with strip electrode and explosion welding. The relaxed deformation measurement on clad plate surfaces was performed by applying centre-hole drilling method using special measuring electrical resistance strain gauges (rosettes). After performed measuring, size and nature of residual stresses were determined using analytical method. Depending of residual stresses on depth of drilled blind-hole is studied

Utjecaj toplinske obradbe žarenjem na zaostala naprezanja platiranih ploča

The influence of applied clad procedure as well as heat treatment by annealing (650 °C/2h) on level and nature of residual stresses was researched. Three clad procedures are used i.e. hot rolling, submerged arc welding (SAW) with strip electrode and explosion welding. The relaxed deformation measurement on clad plate surfaces was performed by applying centre-hole drilling method using special measuring electrical resistance strain gauges (rosettes). After performed measuring, size and nature of residual stresses were determined using analytical method. Depending of residual stresses on depth of drilled blind-hole is studied.U članku su prikazani rezultati istraživanja utjecaja toplinske obradbe žarenjem (650°C/2h) na veličinu i narav zaostalih naprezanja platiranih limova. Korištena su tri postupka platiranja tj. toplo valjanje, elektrolučno navarivanje pod praškom (EPP) elektrodnim trakama te platiranje eksplozijom. Provedena su mjerenja relaksiranih deformacija metodom bušenja središnjeg provrta koristeći elektro-otporničke mjerne rozete. Nakon provedenih mjerenja, veličina i narav zaostalih naprezanja su određeni koristeći analitičku metodu. Istraživana je ovisnost vrijednosti zaostalih naprezanja o dubini zabušivanja središnje rupe