welding qualification according to iso 5817 level b · welder 1i: •part 1: excessive distortion...
TRANSCRIPT
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welding qualification according to ISO 5817
level B
(cooling channel welds)
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Part 1
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•distortion is not specified in norm,
•stray arc and small cavity do not fulfil the norm.
Part 1(left), welder 1
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•distortion is not specified in norm,
•stray arc does not fulfil the norm.
Part 1(right), welder 1
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Part 1(left), welder 1I
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Part 1(right), welder 1I
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Part 1I
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Part 1I(left), welder 1
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• martensite probably formed because tube was held in position by an inner pin, when the weld cooled down, and the material was subject to plastic deformation,
• only a problem for cryogenic temperatures or if magnetism is critical.
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Part 1I(right), welder 1
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•same as for left side,
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Part 1I(left), welder 1I
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•does not fulfil the norm,•but is not significant.
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Part 1I(right), welder 1I
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•does not fulfil the norm,•but is not significant.
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Part III
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Part III (left + right), welder 1:perfect welds!
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Part III (left + right), welder 1I:perfect welds!
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Part IV
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Part 1V(left), welder 1
•probably not critical,•but could be improved ,
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Part 1V(right), welder 1
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•probably not critical,•but could be improved,
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Part IV (left + right), welder 1I:perfect welds!
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Welder 1I:•Part 1: Excessive distortion
+ stray arc + shrinkage cavity could be observed•Part 2: Full penetration on
inner tube, root oxidation could be observed.•Part 3: Penetration between
2.1 mm and 2.4 mm •Part 4: Penetration between
2.9 mm and 3.1 mm
Welder 1:•Part 1: Excessive distortion
+ stray arc + shrinkage cavity could be observed.•Part 2: No weld
imperfection could be observed, probable presence of martensite.•Part 3: Penetration between
1.8 mm and 2.2 mm.•Part 4: Penetration of 2.6
mm, root oxidation + lack of fusion could be observed.
Summary
Root oxidation (“backfilling” with protective gas?) and lack of fusion are not permitted according to level B of ISO 5817