More than 45 years of professional manufacturing experience, WUXI TBS SCIENCE AND TECHNOLOGY CO., LTD have been one of the leading manufacturer in China,mainly specialize in ERW Tube&Pipe Mill Line, Slitting Line, Cut to length line, etc.

Throughout many decades team efforts for improvement of superior product quality and pursuit of advanced technology, we have widely won high praise from domestic and overseas customer.

We always keep strong faith in “Thinking for what customer think”.

Our mission: “Customized Technical Support,Most Cost-Effective Commerical Solution,High Performace Machine Supply,Reliable Service After-Sales”

Our TZG series ERW/API Welded Pipe&Tube Line with the latest technology,meet high efficiency output ,easily operated and stable running performance,also the complete tube mill line meet a high level automation.

This ERW/API tube mill series with excellent design, selected high precision durable roller under strictly quenching , high performance cutting saw, complete machine body with heat treatment, accurate fabrication, precise assembly.

The machine performance has reached the international ERW welded tube standard. This tube mill series outer diameter range can be from Φ140mm to Φ 630mm and wall thickness of 4.0～22.0mm,all these size tubes are produced with large output, best quality and high precision.Our customized machines are also can be used for different processed material and meet nearly all applications.

Specification of ERW/API Welded tube mill line

Finished Products

• 1.Uncoiler butt weld
• 2.Shear and butt weld
• 3.Horziontal accumlator
• 4.Forming
• 5.HF welding
• 6.Sizing
• 7.Turkey straightener head
• 8.Cut off saw
• 9.Milling saw

High-frequency welding principle -

With the skin effect of high-frequency current, the high-frequency energy can be concentrated on the surface of the weldment, and the proximity effect can be used to control the position and range of the high-frequency current flow path. When high-frequency current is required to focus on a part of a weldment,this requirement can be achieved by forming a current loop between the conductor and the weldment and bring the conductor close to this weldment part so that they form a contiguous conductor with each other.High-frequency welding is based on the specific form of weldment structure and special requirements, main using effect and proximity effect so that the weldment can be welded by the surface of the metal quickly heated.

Two effects of High-frequency welding of high-frequency current:
Skin effect - a physical phenomenon when the conductor through the AC current,the current cross section of the conductor uneven distribution,the current density gradually increased from the conductor center to the surface,most of the current only flow along the surface of the conductor. The lower of conductor resistivity, the more permeability, the higher frequency of the current, the more signifi that its skin effect attend.
Proximity Effect - a special physical phenomenon when a high-frequency current flows reversely between two conductors or in a reciprocating conductor, current concentrates flows on the vicinity of the conductor.
The current frequency common range used for high frequency welding is 300-450kHz, sometimes it can use as low as 10kHz.

The feature of High Frequency welding:
1.The current highly concentrate on welding area,heating rate is extremely fast so the welding speed 150-200m/min.
2.Because of high speed welding speed and the cooling rate of welding parts is strong therefore not only Heating zone is small also not easily oxidized so the mircrostructure and property of welding seam is excellent.
3.The surface of welding parts don’t need to be clean so working effiency will be high.
4.Wide range of metal can be welded ,used for welding different shape and specificaiton .