Cswip 3.1 Exam

1. When 'hydrogen control' is specified for a manual metal arc welding project, the electrode would normally be:

Neutral

BASIC

Cellulosic

Acidic

In manual metal arc welding, 'hydrogen control' typically refers to the use of basic electrodes to help reduce hydrogen levels in the weld metal and prevent cracking. Basic electrodes contain high levels of calcium carbonate or calcium fluoride, which helps to neutralize hydrogen and reduce the risk of hydrogen-induced cracking.

Explanation

In manual metal arc welding, 'hydrogen control' typically refers to the use of basic electrodes to help reduce hydrogen levels in the weld metal and prevent cracking. Basic electrodes contain high levels of calcium carbonate or calcium fluoride, which helps to neutralize hydrogen and reduce the risk of hydrogen-induced cracking.

2. How can you recognize a hydrogen controlled flux covered electrode?

Arc voltage

Manufacturer's logo

Color of the electrode coating

BS639/AWS CODE LETTER

The most common way to identify a hydrogen controlled flux covered electrode is through its BS639/AWS code letter, which provides important information about the electrode characteristics.

Explanation

The most common way to identify a hydrogen controlled flux covered electrode is through its BS639/AWS code letter, which provides important information about the electrode characteristics.

3. Why is pre-heating a carbon steel manual metal arc welding carried out?

Reducing the risk of electrical shock hazards

Preventing the spread of fire during welding

Improving the overall weld appearance

PARENT METAL CRACKING

Pre-heating is done in welding to reduce thermal stress in the parent metal, which helps prevent cracking.

Explanation

Pre-heating is done in welding to reduce thermal stress in the parent metal, which helps prevent cracking.

4. When submerged arc welding is used to make butt welds, which would you be most critical of?

THE ROOT GAP TOLERANCE

The ambient temperature during welding.

The color of the welding materials.

The brand of welding machine being used.

The root gap tolerance is crucial in submerged arc welding to ensure proper penetration and fusion of the weld. The other factors mentioned do not have as direct of an impact on the quality of the weld.

Explanation

The root gap tolerance is crucial in submerged arc welding to ensure proper penetration and fusion of the weld. The other factors mentioned do not have as direct of an impact on the quality of the weld.

5. A fabricating procedure calls for fillet welds to be 'blended in' by grinding. This influences:

Corrosion resistance

Tensile strength

Weld appearance

FATIGUE LIFE

Grinding fillet welds can have an impact on the fatigue life of the weld structure. Changing the geometry of the weld through grinding can introduce stress concentrations and potential areas for crack initiation, affecting the fatigue properties of the welded joint.

Explanation

Grinding fillet welds can have an impact on the fatigue life of the weld structure. Changing the geometry of the weld through grinding can introduce stress concentrations and potential areas for crack initiation, affecting the fatigue properties of the welded joint.