From Tungsten Electrode to GTAW Arc Stability Test Materials under High Pressure

Test material:

(1) Base metal: API 5L X56 Steel Inserts pipeline steel tube, dimensions: 168.3mm (outer diameter) × 9.5mm (thickness).

API 5L X56 pipeline steel chemical composition (%)

Element	Nb	V	Ti	Mn	C	S	P
Component	≥0.005	≥0.005	≥0.005	≤1.5	≤0.26	≤0.050	≤0.040

Mechanical properties of API 5L X56 pipeline steel tube

Project	Ductility	Strength of extension	Limit of yielding	Test pressure (max.)
Indicators	22%	489.545 MPa	386.12 MPa	20.685 MPa

Electrode is adopting lanthanum tungsten electrode, because it owns good ablation resistance, large emission current and without pollution, and so on. Studies have shown that lanthanum tungsten electrode possesses the most outstanding performance. (1) Owns the best arc performance and its arc voltage value is the minimum ;( 2) when the arcing time is longer, lanthanum tungsten electrode’s working temperature is low,at this time its burning resistance is maximum, keep the shape of the tip long, the highest electron emission ability. (3) 2% lanthanum oxide electrode having good workability.

Environmental conditions: hyperbaric welding test chamber (volume of 5.5m3; maximum working pressure of 1.0MPa; design pressure 1.5MPa); high pressure gas tank deployment (capacity 5.5m3; maximum working pressure of 4.4MPa; design pressure 4.85MPa); CPLMS1000-25K CCD & CMOS high-speed digital camera (up 25000ftp); QWZH - 315 type all-position automatic welding machine, this machine has a control of high precision welding.



 

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