Ing proses manufaktur menara daya angin, welding minangka proses sing penting banget. Kualitas welding langsung mengaruhi kualitas produksi menara. Mula, kudu ngerti sebab-sebab cacat Weld lan macem-macem cara pencegahan.
1. Bolongan Udara lan inklusi slag
(1) Alasan utama kanggo bolongan udara: ana roda minyak, lsp ing permukaan logam dhasar utawa logam sing bakal saya tambah yen rod lan fluks sing ora garing, amarga karat , noda minyak, lan kelembapan ing lapisan lan fluks saka rod welding diuripake menyang gas kanthi suhu sing dhuwur, nambah isi gas ing logam suhu dhuwur. The welding line energy is too small, and the cooling speed of the molten pool is large, which is not conducive to the escape of gas. Insufficient deoxidation of weld metal will also increase oxygen porosity.
(2) cilaka blowholes: Blowholes nyuda area bagean sing efektif lan ngeculake weld, saéngga nyuda kekuwatan sendi lan nyebabake bocor. Porosity is also a factor that causes stress concentration. Hydrogen porosity may also contribute to cold cracking.
a. Copot noda minyak, teyeng, banyu lan sundri saka kawat welding, alur kerja lan permukaan sing cedhak.
b. Alkaline welding rods and fluxes shall be used and thoroughly dried.
c. DC reverse connection and short arc welding shall be adopted.
Crackle
a. Reduce the content of harmful elements such as sulfur and phosphorus, and weld with materials with low carbon content.
b. Unsur wesi tartamtu ditambahake kanggo nyuda kristal lan segregasi kolom. Contone, aluminium lan wesi bisa nyaring pari-parian.
c. Weld kanthi seng nembus cethek bakal digunakake kanggo nambah kahanan dissipation panas supaya bahan titik lebur sing kurang ngambang ing permukaan weld lan ora ana ing weld.
d. Welding specifications shall be reasonably selected, and preheating and afterheating shall be adopted to reduce the cooling rate.
e. Adopt reasonable assembly sequence to reduce welding stress.
a. Pay attention to the strengthening effect of metallurgical elements and their influence on reheat cracks.
b. Reasonably preheat or use afterheat to control the cooling rate.
c. Nyuda stres residual kanggo nyegah konsentrasi stres.
d. Sajrone nyuda, ngindhari zona suhu sensitif retak utawa nyepetake wektu ing zona suhu iki.
a. Jenis hidrogen jenis alkaline rod bakal digunakake, garing kanthi tegas, disimpen ing 100-150 ℃, lan digunakake nalika njupuk.
b. Suhu kasebut bakal tambah, langkah pemanasan pos bakal dijupuk, lan suhu interpass ora kurang saka suhu mangsa. The reasonable welding specification shall be selected to avoid brittle and hard structures in the weld.
c. Select reasonable welding sequence to reduce welding deformation and welding stress.
d. Nganakake perawatan panas hidrogen ing wektu sawise welding
Wektu Pos: Nov-08-2022