chhung hian Welding machine process thermal process, metallurgical reaction, welding stress leh deformation, chemical composition, metallographic structure, size leh shape inthlak danglamna thlen thei, weld-a awm dan chu base metal nen a danglam fo thin a, a chang chuan hman dan tur pawh a tlin thei lo. Active metal emaw refractory metal tam tak tan chuan special welding method, electron beam welding emaw laser welding emaw hmangin weld quality tha tak tak hmuh theih a ni. Thil hman tur a tlem poh leh weld tha tak siam a harsat poh leh a material weldability a tha zawk a; Chutih rualin, welding method complex leh man to tak tak, special welding materials leh process measures mamawhna chuan he material hi weldability a tha lo tihna a ni.
Kan hman hunah chuan . Automatic Welding Tracking System Thil siam chhuah tur chuan structural material thlan chhuah, welding material leh welding method te chu a dik em tih hriat nan kan hman tur thilte weldability kan evaluate hmasa tur a ni. Materials weldability tehna tur kawng tam tak a awm a, method tin hian weldability lam hawi deuh chauh a hrilhfiah thei a ni. Chuvangin, weldability kimchang taka hriat theih nan test neih a ngai a ni. Test method hi simulation type leh experimental type ah then theih a ni. A hmasa zawk hian welding heating leh cooling characteristic a simulate a; A hnuhnung zawk hi welding condition tak tak angin test a ni. Test content chu a bik takin base metal leh weld metal-a chemical composition, metallographic structure, mechanical property, welding defect awm leh awm loh te, low-temperature performance, high-temperature performance, corrosion resistance leh welded joint crack resistance te hriat theihna tur a ni.
1. Indirect assessment hmanga process weldability hman dan .
Carbon in a nghawng dan hi a langsar ber a nih avangin element dangte nghawng chu carbon influence ah a chantir theih a, chuvangin carbon equivalent hi weldability tha tak tehna atan hman a ni.
Carbon tlukpui chhut dan Formula of carbon steel leh low-alloy structural steel:
CE<0.4% a nih chuan steel plasticity a tha a, hardening tendency a lang lo a, weldability pawh a tha hle. General welding technical condition hnuaiah chuan welded joint te chu a chhe lo ang a, mahse a hmun thick leh lian emaw, temperature hniam taka welding emaw tan chuan preheating ngaihtuah tur a ni
CE chu 0.4 atanga 0.6% a nih chuan steel plasticity a tlahniam a, hardening tendency a sang chho zauh zauh a, weldability pawh a tha lo hle. Workpiece chu weld hmain a lum tha tur a ni a, welding hnuah zawi zawiin a lum a, chu chuan a crack a veng thei a;
CE> 0.6% a nih chuan steel plasticity a chhe zawk a ni. Hardening tendency leh cold cracking tendency a lian hle a, weldability pawh a chhe zawk bawk. Workpiece chu temperature sang zawkah dah a ngai a, welding stress tihziaawmna tur leh cracking venna tur technical measures lak a ngai a, welding zawhah heat treatment dik tak neih a ngai bawk.
Calculation result atanga carbon equivalent value hmuh tam zawk chuan welded steel-a hardening tendency a sang zawk a, heat-affected zone chu cold cracks a thlen awlsam zawk bawk. Chuvangin, CE >0.5% a nih chuan steel chu a harh awlsam a, welding chu crack awm loh nan preheated a ngai a, plate thickness leh CE a san chuan preheating temperature pawh a sang chho zel tur a ni.
2. Direct evaluation hmanga process weldability .
Welding crack test method-ah chuan welded joint-a crack siamte chu hot crack, cold crack, reheat crack, stress corrosion, laminar tears, etc.-ah te then theih a ni.
(1) T-joint welding crack test dan. Hetiang hmanrua hi carbon steel leh low alloy steel fillet welds te hot crack susceptibility tehna atan hman a ni ber. Hot crack susceptibility-a welding rods leh welding parameter-te nghawng dan pawh hriat theih a ni bawk.
(2) Pressure plate butt welding crack test dan. Hetiang hmanrua hi carbon steel, low alloy steel, austenitic stainless steel electrode leh welds te hot crack sensitivity tehna atan hman a ni ber. Fisco test device-a test piece dah a, groove gap size siamrem hian crack siamnaah nghawng nasa tak a nei a ni. Gap a pun zel chuan crack sensitivity a sang zawk.
(3) Rigid butt joint crack test dan tur. Hetiang hmanrua hi weld zone-a hot crack leh cold crack tehna atan hman a ni ber. Heat-affected zone-a cold cracks te pawh a teh thei bawk. Bottom plate-ah chuan test weld chu test chhunga construction welding parameters tak tak angin an hmang a. Electrode arc welding atan hman a ni ber. Test piece weld hnuah room temperature-ah darkar 24 chhung dah a ni. Crack tan chuan crack leh non-crack te chu a tlangpuiin an evaluate a, condition tin hnuaiah test piece pahnih weld an ni.
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