Tutorial: Engineering technology Topic: Welds´testing Prepared by: Ing. Josef Martinák st. Projekt Anglicky v odborných předmětech, CZ.1.07/1.3.09/ je spolufinancován Evropským sociálním fondem a státním rozpočtem České republiky.
Weld’s quality depends on the type of used technology Depends on prescribed conditions Steel construction welding, piping welding, vessels of nuclear reactors Quality of welds are important – it is necessary to test them
Testing plate Mandrel Weld deposit Testing plate Mandrel Carry rollers Weld cladding bending test Weld fracture testing
Weld root is checked at bending Bend angle is to120° Damaged weld is fractured
Root run of filler Weld testing is done by fracturing At fractures are visible sand inclusions of coated electrode
Weak current Normal current Heavy current
Spraying by red colour - weld Weld washing – to remove red colour from surface White colour spraying, red colour rises from weld by capillary action and if it is there – crack is shown.
Longitudinal defect detection– cavities, fissures etc. Resistance and induction welding of steel pipe Screen Defects Tested product Contact medium Probe Limit echo of back wall Failure echo sounds Input sound Measuring instrument
Weld macrostructure X-ray picture – processed by TV chain Deffects - lighter parts Control steel up to width of 80 mm, aluminium 800 mm X-ray lamp Material defects Picture amplifier Video camera Product X-ray radiation Product picture Testing chamber
Describe capillary testing Describe X-ray testing What does the weld resistance to bend depend on?
DILLINGER. KOLEKTIV. Moderní strojírenství pro školu i praxi. ISBN pro konkurenceschopnost, ESF 2007 – Translation: JANATA, Petr. Handy slovník technický anglicko-český a česko-anglický. Plzeň: Nakladatelství Fraus, ISBN Lingea LEXIKON 5, Technický slovník anglicko-český a česko-anglický