Welding leh complete cooling tawp hnua internal stress awm reng chu welding residual stress an ti a. Welding residual stresses te hi a hnuaia mi ang hian classified a ni:
1. Stress awm chhan ang zelin .
(1) Thermal stress: Welding hi a lum leh a lum dan inang lo tak a ni. Weldment chhunga stress awm chhan ber chu invenna leh temperature danglamna avanga lo awm a ni a, chu chu thermal stress an ti a, temperature stress tia hriat bawk a ni.
(2) Restraint stress: Structure ngei emaw, pawn lam atanga insumna avanga stress lo awm ber chu restraint stress an ti a.
(3) Phase transformation stress: Welded joint area-a microstructure transformation inang lo avanga stress awm chu phase transformation stress an ti a, microstructure stress tia hriat bawk a ni.
(4) Hydrogen-induced concentrated stress: Microscopic defect-a diffusible hydrogen pungkhawm avanga stress awm chhan ber chu hydrogen-induced concentrated stress an ti a.
Heng residual stress pali zingah hian thermal stress hi a tam ber a ni. Chuvangin, stress awm chhan ang chuan chi hnih ah then theih a ni a, chungte chu thermal stress (temperature stress) leh phase transformation stress (tissue stress) te an ni.
2. Space-a stress awm dan tur angin .
One-way stress, two-way stress leh three-way stress ah te then theih a ni
(1) Unidirectional stress: Weldment-a kawng khata awm stress hi unidirectional stress an ti a, line stress tia hriat bawk a ni. Entirnan, welded sheet-a butt weld leh weldment chunglama surfacing-a stress lo awm thin te hi a ni.
(2) Bidirectional stress: Weldment-a plane-a perpendicular direction pahnih-a stress hnathawh chu bidirectional stress an ti a, plane stress tia hriat bawk a ni. A tlangpuiin welded structure-ah a awm a, chu chu medium leh heavy plate-ah a awm a, a thuk zawng chu 15-20mm a ni.
(3) Three-way stress: Weldment-a innghahna kawng pathum-a thawk stress chu three-way stress an ti a, chu chu volume stress tia hriat a ni bawk. Entirnan, welded thick plate-a butt weld leh weld-te chu a sir thum a inthuam a, a inkar a stress awm chu a inzawm tlat a ni.
Metal a lum leh a lum hian volume expansion leh contraction chu kawng thum a awm a, chuvangin strict takin sawi ila, weldment-a residual stress lo chhuak chu three-way stress a ni fo thin. Mahse, kawng khat emaw pahnih emaw a stress value chu a tlem hle a, ngaihthah theih a nih chuan bidirectional stress emaw unidirectional stress emaw anga ngaih theih a ni a, a chunga kan sawi tak hi welding residual stress chi khat a ni.
Welded pipe siam chhuahnaah chuan strip steel chu extruded, bent, formed leh welded a ngai a ni. Chutih hunah chuan stress a awm ngei ang. Industrial welded pipe performance tha zawk nei tur chuan heng stress te hi tihbo a ngai a ni. Chutih rual chuan, hun rei tak chhunga sum senso (cost pressure) ngaihtuah chungin, kawng ha leh chakna hmanga chhanchhuah a ngai a ni. hangao tech (Seko Machinery) tih a ni a. Single-tube energy-saving bright annealing induction heater machine hian welded tubes siam chhuahna atana stress lo chhuak chu a paih chhuak thei mai bakah energy save leh environment humhalhna ziarang a nei thei bawk. Thil siam inang tak tak nena khaikhin chuan energy hman tangkai dan chu 20%-30% in a sang zawk a ni. Cooling water circulation system hian tui resources recycling chu a tisang thei a, hun rei tak chhunga a senso tur chu a control thei bawk.
