How to draw a stainless steel pipe?

Stainless steel wire drawing is a kind of metal processing technology and the most popular surface treatment technology in stainless steel and aluminum products industry. The wire drawing effect of stainless steel and aluminum products is treated.

Stainless steel wire drawing pays great attention to procedures and techniques, and generally cooperates with wire drawing machine to repair and restore the scratch position and weld seam of the product, and finally achieves the overall artistic effect of wire drawing.

First, the construction preparation

1, materials and main machines:

(1) Stainless steel pipe: φ 70 pipe is used for surface engineering, and others are selected according to design requirements, with quality certificate.

(2) Stainless steel covered electrode or welding wire: the model should be selected according to the design requirements, and the quality certificate must be available.

(3) Main machines and tools: argon arc welding machine, cutting grinder, impact electric drill, angle grinder, stainless steel wire fine brush, small hammer, etc.

2. Fuck oak parts

(1), familiar with the drawings, completes the technical disclosure of stainless steel fence construction.

(2) The small square brick of the wall pressed by the protective net has been laid.

(3) Before construction, the validity of the welder's certificate should be checked, and the certificate should prove that the welder can undertake the welding work.

(4) The on-site power supply shall meet the requirements of welding power consumption.

5], the construction environment has been able to meet the needs of protective net construction.

Second, the operation process

1, process

Construction preparation → lofting → blanking → welding installation → grinding → weld inspection → grinding.

2, the main construction methods:

(1) Before construction, site lofting should be carried out to accurately calculate the length of various bars.

2, according to the length of the protective net accurate blanking, the allowable deviation of its component blanking length is 65438+/-0 mm. ..

(3) Choose appropriate welding technology, covered electrode diameter, welding current and welding speed. , passed the welding process test.

(4) Degreasing and decontamination treatment: Before welding, check whether the groove and assembly gap meet the requirements, whether the tack welding is firm, and there shall be no oil pollution around the weld. Otherwise, trichloroethylene, benzene, gasoline, neutral detergent or other chemicals should be brushed with stainless steel wire. If necessary, it can be polished by an angle grinder, and the metal surface can be polished before welding.

5], welding should choose thinner stainless steel covered electrode (welding wire) and smaller welding current. When welding, the solder joints between components should be firm, the weld should be full, the welding wave on the metal surface of the weld should be uniform, and there should be no defects such as cracks, slag inclusion, flash, burn-through, arc pits, needle-like pores, etc., and there should be no spatter in the welding area.

[6], bar welding assembly is completed, for no obvious dent or protruding weld bead, can be directly polished. For the weld with concave-convex scum or large weld bead, it should be polished by angle grinder, and then polished. The appearance after grinding must be smooth, flat and without obvious welding marks.

Third, the quality problems that should be paid attention to:

1, the dimension exceeds the allowable deviation: deviation for weld length, width, thickness, centerline deviation, bending, etc. , should strictly control the relative position size of welding parts, welding is allowed only after qualified, and should be carefully operated during welding.

2. Weld cracks: In order to prevent cracks, appropriate welding process parameters and welding procedures should be selected to avoid large current and sudden flameout. The weld should overlap 10~ 15mm, and it is not allowed to move or knock the weldment during welding.

3. Surface blowholes: The welding parts must be scrubbed clean, and proper welding current should be selected during the welding process to reduce the welding speed and make the gas in the molten pool completely escape.