Spiral steel pipe gaw n-gang n-gang kaw na galaw ai spiral hkrang shapraw ai ladat hku nna n-gang n-gang kaba langai mi rai nga ai. Dai hpe sau, wan sau, tsi mawan, hka n-gun hpe makawp maga ai lam ni hta, hka hte htaw sa ai pipeline masing ni hta grai lang ai. Ndai galaw shapraw ai lam hta madung hku nna, raw material hkyen lajang ai, strip level hte shearing, hpaw, welding, weld seam tsi lajang ai, chyam dinglik ai lam hte quality hpe jep joi ai lam ni zawn re ai madung lahkam ni lawm ai. Lahkam shagu gaw hpang jahtum na prut prut ai arung arai a quality hte performance hpe hkrak hkra hkra machyi shangun ai.
1. Raw arung arai ni hpe hkyen lajang ai lam
Spiral steel pipe a matu npawt nhpang raw material gaw, katsi ai-roll (sh) katsi ai{1}}rolled steel coils ni rai nna, Q235B hte Q345B zawn re ai carbon n-gang ni kaw na galaw ai, shing nrai, npu na-}} n-gang tsaw ai n-gang ni kaw na galaw ai. Hpaga lam garai n galaw shi yang, n-gun ja ai n-gun hpe jep joi ai lam ni hpe galaw ai, dai hta, tsi mawan ni hpe sawk sagawn ai lam, jak rung arung arai ni hpe chyam dinglik ai lam (tinang n-gun atsam hte galu kaba wa ai lam zawn re ai), hte npu n-gun n-gun hpe jep joi ai lam (GB/T 9711 hte API 5L zawn re ai) ni hpe hkan sa na matu (ga shadawn, n-gun n-gun, n-gun n-gun, n-gun n-gun ni zawn re ai) ni lawm ai.
2. Strip Leveling hte Shearing
Hpa majaw nga yang, dai strip gaw htaw sa ai (sh) shinggrup ai shaloi, n-gun n rawng ai (sh) undulate byin chye ai majaw, strip hpe ra sharawng ai lam ni hpe hkan sa na matu, leveler langai mi hta level galaw ra ai. Dai hpang, spiral steel pipe a specifications ni hta hkan nna, dai strip hpe ra sharawng ai galu de, nbungli n-gang (sh) grup yin shingnip hpe lang nna, hpang na hkrang shapraw ai aten hta matut manoi byin wa na hpe kam mai ai.
3. N-gup de hkrang shapraw ai
Forming gaw spiral steel pipe galaw ai hta madung lahkam rai nga ai. Dai strip hpe matut manoi welding galaw ai shaloi, n-gun rawng ai jak (ga law malawng gaw shinggan (sh) kata kaw hkang ai roller forming machine) hku nna, kalang ta spiral tube langai mi de shinggrup da ai. Dai zawn re ai jak a rollers ni hpe, strip jut ni hpe loi loi hte shinggyin la lu na matu, langai ngai a angle (galaw madang 1.5℃kaw nna 3℃) hku nna gram lajang nna, ngang grin ai spiral byin wa ai. Hpaw hpang ai aten hta, strip tension, lawan ai, roller a n-gun hpe grai ngang ngang jum tek da ra ai, dai gaw tube a grup yin, hkrak ai, langai sha re ai weld gap hpe hkam la lu na matu re.
4. Welding galaw ai lam
Spiral steel pipe ni hpe hka kata na arc welding (SAW) hpe lang nna, n-gun n rawng ai hku galaw da ai, dai hpe lahkam lahkawng hku garan nna, kata na welding hte shinggan na welding.
Kata na welding: Single- wire (sh) twin{1}} wire SAW hpe lang nna, n-gup magap kata de shang nna shang wa lu na matu, pipe kata na weld a ru hpe weld galaw na matu lang ai.
Shinggan na welding: Multi- wire SAW (galaw madang hku nna twin (sh) triple wires) hpe shinggan de lang nna, welding galaw ai atsam hpe grau kaja hkra galaw ya lu nna, weld n-gun hte hkrang bung sumla hpe mung hkam la lu ai.
Welding parameters (ya aten, n-gun n-gun, hte lawan ai zawn re ai) hpe strip galu ai hte arung arai ni hte maren hkrak hkra gram lajang ra ai, dai gaw porosity, slag inclusions, fusion n nga ai zawn re ai n kaja ai lam ni hpe koi lu na matu re. Nkau high{1}}end spiral pipe ni hta mung pre{2}welding + ngut kre ai ladat hpe jai lang ai, shawng nnan e, weld hpe makawp maga na matu, shawng nnan e, tsaw ai{4}}}beling hpe lang nna, hpang jahtum na weld a matu lup mat ai arc welding galaw ai.
5. Weld Seam tsi ladat
Welding ngut ai hpang, weld seam hpe ngut kre hkra galaw ra ai:
Weld seam grinding: Ndai gaw weld excess hpe shapraw kau ya ai, weld hte base material lapran hta n-gun n rawng ai galai shai lam hpe shabyin ya ai, stress ni a n-gun hpe shayawm ya ai. Ultrasonic chyam dinglik ai lam (UT): Hkamja lam hte seng nna, kata na n kaja ai lam ni a matu jep joi ai lam ni (pores hte cracks zawn re ai) ni a matu jep joi ai lam ni hpe galaw ai.
X{0}}y Testing (RT): Weld quality madang ni hpe hkan sa lu na matu, ahkyak ai shara ni hpe jahten sharun ai hku chyam dinglik ai lam galaw ai.
6. Ja gumhpraw hte ngang kang ai lam
Welding stress hpe yeng seng kau na matu hte dimensional hkrak ai lam hpe grau kaja hkra galaw na matu, spiral steel pipe ni gaw jat wa ai (hydaulic (sh) mechanical jat wa ai lam) hpe hkam sha ra ai. Dai hpang shanhte hpe project installation ra ai lam ni hpe hkan sa na matu dingyang galaw ai.
7. Hpang jahtum galaw ai lam hte jep joi ai lam
Customer ni ra sharawng ai hta hkan nna, spiral steel pipe ni a jahtum ni hta, beveling (weldding a matu) shing nrai, flattening (flange connections ni a matu) ra na re. Hpang jahtum, pipe ni gaw grai sawng ai quality hpe jep joi ai lam ni hpe galaw ai, dai ni hta:
Dimensional jep joi ai lam (shinggan na diameter, bunghku a n-gun, hte ovality);
Pressure chyam dinglik ai lam (hka shing nrai nbung n-gun chyam dinglik ai lam hpe jep yu na matu);
Anti-corrosion tsi lajang ai lam (epoxy powder coating (sh) 3PE coating zawn re ai ni hpe n-gun shayawm ai lam hpe grau kaja hkra galaw na matu).
8. Labeling hte htaw sa ai lam
Qualified spiral steel pipe ni hpe madang masat da ai hku masat da ai (ga shadawn, arung arai, masat da ai, galaw shapraw ai batch nambat) hte bungli masing shara de n sa shi yang, n-gun jat ai hte jai lang na matu, shinggyin tawn da ai (sh) shinggyin tawn da ai.
Daw dan lam
Spiral steel pipe ni a matu galaw shapraw ai lam hta, hkrak ai lahkam law law lawm ai, n-gun ja ai quality control hpe raw materials kaw nna, ngut sai arai ni du hkra galaw ra ai. Hpaji masa rawt jat wa ai lam ni, n-gun jaw ai lam ni hpe jai lang ai, hpaji rawng ai hku welding, hte non{1}} n-gun n rawng ai chyam dinglik ai lam ni lawm ai, spiral steel pipe ni a galaw shapraw ai atsam hte kam hpa mai ai lam hpe grau nna jat wa shangun ai majaw, dai ni na pipeline engineering hta n mai garan ginhka ai arung arai langai byin wa ai.
