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How to identify quality square tube?
Time 2014-7-15 See 1091
 
Product end face cut upright. Side length dimension greater than 100mm product ends cut slope is not greater than 1mm, the side length dimension greater than 100mm, but the end product is less than 200mm cut slope is not greater than 1.5mm, the smaller the deformation caused by the cutting method is not allowed, and more than 1.0mm internal and external burrs exist. 
Weld cracks are not allowed to open welding defects 

The concave portion of the cross-sectional plane is not more than 0.5mm 
Degree twist: full length length length L 5m of the total torsional degree 3mm, cut length 5m <L 10 mm in total length overall torsional degrees 5mm 
Products do not allow any form of presence of the entire length of the joint 
In product lines must be 100% visual inspection of the weld 
Qualified by visual inspection of the product and then 20% the proportion of penetration testing, the results should be consistent with the level of acceptance JB/T9218-2007 level, if found microcracks, need to redouble its detection frequency test

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