1, according to the diameter of reel making school circle model, the arc length of the pipe circumference of 1/6 ~ 1/4, do not fit the gap to meet the requirements.

　　2、管子、管件組對時，應檢查坡口質量。并對坡口內外側進行清理，有銹垢可采用砂輪機磨光。

　　2. The quality of the groove shall be checked when the pipe and pipe fittings are in alignment. And cleaning the inside and outside sides of the groove. There is rust and can be polished by sanding machine.

　　3、核對材料和規格是否符合設計要求，材質證明和合格證是否齊全，有開裂縮孔、起皺、分層等缺陷，應拒絕使用。

　　3, check the material and specifications are in line with the design requirements, materials and certificates are complete, there are cracks, shrinkage, wrinkling, delamination and other defects, should be refused to use.

　　4、焊條要求：焊接碳素鋼的焊條采用E4303焊條，焊接16Mn鋼板的焊條采用E5016焊條。當16Mn鋼與碳素鋼接縫處E4316焊條。焊條使用之前，應按說明書進行烘干，并在使用中保持干燥，焊條藥皮應無脫落和明顯裂紋。

　　4, welding rod requirements: welding carbon steel welding rod using E4303 welding rod, welding 16Mn steel plate welding electrode, using E5016 welding rod. When 16Mn steel and carbon steel joint, E4316 welding rod. Before welding the electrode, it should be dried according to the instruction manual and kept dry in use. The electrode coating should be free of cracks and obvious cracks.

　　6、先做壓頭處理，再進行卷制。

　　6, the first pressure head treatment, and then roll system.

　　7、正式施工焊的材料焊接工藝相同。

　　7, the formal construction of welding materials, welding process is the same.

　　8、壁厚不同的管子對焊時，兩管壁厚之差不得大于管壁厚度的15%，并不得超過3mm。

　　8. When the wall thickness is different, the difference between the wall thickness of the two pipe shall not exceed 15% of the thickness of the pipe wall and shall not exceed 3mm.

　　9、不同直徑的管子對焊時，可將大管焊接端抽條加工成大小頭，也可采用鋼板制作大小頭。

　　9, different diameter of the pipe butt welding, can be welded to the end of the big pipe processing into big head, also can use steel plate making big head.

　　濟南通風管道工程愿以佳的服務意識，迎接八方來客，誠懇與國內外各界朋友精誠合作，共創美好的前程。歡迎大家前來參觀洽談!

　　We would like to serve the eight guests with the best sense of service, and sincerely cooperate with friends from all walks of life at home and abroad for a better future. Welcome to visit and negotiate!

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