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1. Squash Test
           Welding part of the experiment that compressed under extreme stress to check its strength: If specimen can withstand the provisions of compressive stress fracture occurred without inspection for compliance.
2. Expanding test
           The pilot extended to the mouth of the outer diameter of 1.2 times. The photos are shown side, the widening of the mouth without cracks.
3. Flange Test
           After the photo below for the specimen, whether in part or in the welding test-pieces of metal flange on the no cracks.
4. Chemical analysis
           Welded steel pipe weld raw materials and add the chemical composition of a chemical analysis of the chemical constituents in line with standard security regulations.
5. Hydrostatic test
           Pressure by the use of a hydrostatic test with the requirements under the pressure of stay, the leakage does not qualified.
6. Corrosion test
           For the industrial corrosion-resistant steel, have been standards for corrosion or agreement between the two parties, a steel pipe and weld corrosion resistance testing may be inclined to intergranular corrosion.
7. FLAWLESS
           Pressure on the industrial use of corrosion-resistant, eddy current testing or X-ray to ensure that the internal structure of steel dense nonporous, inclusion, micro-cracks.
8. Other forms of testing
           By users special requirements, special test methods.
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