1, check whether the material and specifications meet the design requirements, material proof and certificate are complete, there are cracks, shrinkage, wrinkle, delamination and other defects, should be refused to use.

2、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(dāng)16Mn鋼與碳素鋼接縫處E4316焊條。焊條使用之前，應(yīng)按說明書進行烘干，并在使用中保持干燥，焊條藥皮應(yīng)無脫落和明顯裂紋。

2, electrode requirements: welding carbon steel electrode used E4303 electrode, welding 16Mn steel plate electrode E5016 electrode. E4316 welding rod at the joint of 16Mn steel and carbon steel. Before welding electrodes are used, they should be dried according to the instructions, and be kept dry in use.

3、卷焊管材壁厚≥ 6mm應(yīng)在下料時，打好坡口，用坡口機加工坡口。

3. If the thickness of the welded pipe is more than or equal to 6mm, the groove should be formed when the material is cut off and the groove is machined with the beveling machine.

4、先做壓頭處理，再進行卷制。

4, first do pressure head treatment, and then roll up.

5、根據(jù)卷管直徑制作校圓樣板，弧長為管子周長的1/6～1/4，不貼合間隙符合規(guī)定要求。

5, according to the diameter of the reel, make the calibration template. The arc length is 1/6 to 1/4 of the circumference of the pipe, and the gap is not in conformity with the specified requirements.

6、管子、管件組對時，應(yīng)檢查坡口質(zhì)量。并對坡口內(nèi)外側(cè)進行清理，有銹垢可采用砂輪機磨光。

6, when the pipe and fittings are set, the quality of the groove should be checked. The inner and outer sides of the groove are cleaned up, and the rust scale can be worn by the grinding machine.

7、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。

7. When butt welding with different wall thickness, the difference of the thickness of the two tube wall shall not be greater than 15% of the wall thickness and shall not exceed 3mm.

8、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。

8. Butt welding of pipes with different diameters can produce large ends of welded ends of large tubes and large heads made of steel plates.

9、正式施工焊的材料焊接工藝相同。

9. The welding technology of the formal construction welding is the same.

7、一般先涂刷二道紅丹酚醛防銹漆，再涂刷兩道各色油性調(diào)和各種磁漆。

7, generally brush two red Dan phenolic antirust paint, and then brush two colors of oil and all kinds of varnish.

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