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Stainless steel classification leh welding characteristics te tawi te tea hman tan a ni.

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Stainless steel hi a steel structure a zirin chi li-ah then theih a ni a, chungte chu austenitic stainless steel, ferritic stainless steel, martensitic stainless steel, leh austenitic-ferritic duplex stainless steel te an ni. A hnuaia tarlan te hian austenitic stainless steel leh two-way stainless steel te welding characteristics an zirchiang ber a ni.

(1) Austenitic stainless steel welding .

Austenitic stainless steel hi stainless steel dang aiin weld a awlsam zawk. Eng temperature-ah pawh phase change a awm lo va, hydrogen embrittlement-ah pawh a sensitive lo. Austenitic stainless steel joint pawh welded state-ah hian plasticity leh toughness tha zawk a nei bawk. Welding lama harsatna lian ber chu: welding hot cracking, embrittlement, intergranular corrosion leh stress corrosion te hi a ni. Chu bakah, thermal conductivity tha lo, linear expansion coefficient lian tak, welding stress leh deformation lian tak avang te pawh a ni. Welding kan tih hian welding heat input chu a tlem thei ang bera dah tur a ni a, a lum tur a ni lo va, interlayer temperature pawh tihhniam tur a ni. Interlayer temperature chu 60°C hnuaiah control tur a ni a, weld joint te chu staggered tur a ni. Heat input tihtlem nan chuan welding speed hi a tam lutuk tur a ni lo va, welding current tihtlem nan siamrem tur a ni.

(2) Austenitic-Ferritic two-phase stainless steel welding .

Austenitic-ferritic bidirectional stainless steel is a duplex stainless steel composed of austenite and ferrite. Austenitic steel leh ferritic steel thatna te a inzawm khawm a, chuvangin chakna sang tak, corrosion resistance tha leh welding awlsam tak a nei a ni. Tunah hian duplex stainless steel chi thum a awm ber a, chungte chu CR18, CR21, leh CR25 te an ni. Hetiang steel welding chi hrang hrangte hi a nihna ber chu: austenitic stainless steel nena khaikhin chuan thermal tendency a hniam zawk a Pure ferritic stainless steel nena khaikhin chuan welding hnuah embrittlement duhna a nei tlem zawk a, welding heat-affected zone-a ferrite coarsening degree pawh a hniam zawk bawk a, chuvangin weldability pawh a tha zawk.

Hetiang steel chi hrang hrang welding performance tha tak avang hian welding lai hian preheating leh post-heating a ngai lo. Thin plate te chu TIG nen weld tur a ni a, plate medium leh thick te chu electrode arc welding hmangin weld theih a ni bawk. Special electrode chu base metal nena inang chiah composition nei emaw austenitic electrode carbon content hniam tak nei te chu electrode arc welding atan thlan tur a ni. Nickel hmanga siam alloy electrode hi CR25 dual-phase steel atan pawh hman theih a ni.

Dual-phase steel-a ferrite tam tak a awm avangin, 475°C-a brittleness, σ phase precipitation embrittlement leh coarse grains te ang chi ferritic steel-te inherent embrittlement tendency chu welding machine-a balance effect a awm avangin a la awm reng a, chu chu a tlem berah i mamawh a nih chuan a ni. Duplex stainless steel leh ni hniam lo te weld hian heat-a nghawng zone-ah hian single-phase ferrite leh grain coarsening tendency a awm a. Hetih lai hian welding heat input control nan ngaihven a ngai a, low current, high welding speed, leh narrow pass welding hman tum bawk ang che. leh multi-pass welding grain coarsening leh single-phase ferrite awm lohna hmunah chuan layer inkar temperature chu a sang lutuk tur a ni lo va, a hnuaia pass chu khawsik hnuah weld a tha ber.

A chunga kan sawi pahnihte hi weld awlsam zawk chi an ni. Mahse, stainless steel chi hrang hrang, weldability tha lo tak tak, ferrite ang chi te pawh a awm bawk. Hetih lai hian kan patented welding auxiliary tool- hi ngaihtuah turin kan fuih a che.A rilru a buai em em a, a rilru a hah em em bawk a.. Hangao Tech (Seko Machinery) chuan kum 20 kalta chhung khan welded pipe siamna hmanrua industry-a experience leh data te chu a khaikhawm a, chutiang chuan welding speed pawh a tha tawh a, mahse weld quality pawh a ngaihtuah thei bawk. Weld quality chu guarantee a ni a, welded pipe chu processing atana process dang a luh chuan scrap rate chu effective takin a tihhniam theih a, output pawh a ti sang thei bawk.

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