Surface hardening
Through different heat source to heat precision steel tube, when the temperature of the workpiece surface is above the critical point for cooling, so got hardened surface layer and the core is still keeping the original tissue. More for induction heating in industrial application and flame heating surface hardening.
The chemical heat treatment
Will add heat and heat side impact beams preservation products placed in the medium containing active element, make the active atoms into product surface or form a compound coating, to change the surface of the organization and the chemical composition, which makes the surface of the workpiece in mechanical/physical and chemical properties.
Contact resistance heating quenching
Through electrodes will be less than 5 v voltage is added to the precision steel tube, the electrode and its current through the large contact area, and produce a lot of heat resistance, make its surface heating to the quenching temperature, then move the electrode, heat is introduced into products within the surface cooling, the purpose of quenching.
Electrolytic quenching
To place it in acid, alkali or salt aqueous side impact door beams electrolyte, the products meet the cathode and anode electrolyzer. After direct current electrolyte by electrolysis, release oxygen in the anode, hydrogen in precision steel pipe. Hydrogen gas film around the product, a resistance and generate heat, heat the surface to the quenching temperature, then power outages, gas film disappears, electrolyte becomes a quenching cooling medium, make its surface cooling and hardening.
Cold drawn precision steel tube is the manifestation of poor welding welding management intermediate above on both sides, the product welding surface uneven, more not smooth.
Hi-lo product can make the welding area decreases, the specific work is easy to cause stress, reducing compressive strength of the welding. Weld forming and hi-lo faults because the welders actual caused by improper operation. Such as welding such as high working voltage, welding speed too fast is caused by the faults. For welding aluminium coated steel tube molding and hi-lo faults, should strengthen precision steel pipe welding welders skills and work quality, should exercise strict supervision on welding products.
In flash welding defects root cause is the result of a welding seam to eliminate not neat or electrode metal oxide air pollutants. For flash is supposed to, about the product welding seam clean-up, manipulation of the welding environment, avoid scraps into the welding. Surveillance in mouth of cold drawn precision steel pipe right or wrong, and the main ruler on one side of the weld, then highly feet move to just touch the other side of the weld. Out the accurate measurement of height to width ratio is hi-lo amount, according to specifications and specific needs right and wrong, mouth in manipulation.
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