Read e-book online A Quick Guide to Welding and Weld Inspection PDF

By S E Hughes

ISBN-10: 1845696417

ISBN-13: 9781845696412

A concise and obtainable consultant to the information required to fulfil the position of a welding inspector. In overlaying either ecu and US-based codes, the ebook provides these wishing to realize certification in welding inspection a simple all-round realizing of the most topic matter.

  • A concise and obtainable advisor to the data required to fulfil the position of a welding inspector
  • Covers either ecu and US-based codes
  • Gives these wishing to achieve certification in welding inspection a uncomplicated all-round realizing of the most topic matter

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Additional resources for A Quick Guide to Welding and Weld Inspection

Example text

If mechanical cutting such as machining (normally required for weld joint preparations containing a radius such as a U or J prep) or shearing is used then consideration must be given to the possibility of having cutting fluids trapped in the cut edges. These can cause porosity or other weld defects unless they are properly cleaned out (the edge may look smooth but under a microscope it will be full of peaks and troughs). Weld joint: shape The shape of the joint (joint type) can affect not only the final mechanical properties of the weldment but also the level of distortion produced in it.

This is referred to as direct current electrode positive (DCEP) or direct current electrode negative (DCEN). The type of current and polarity is determined by the electrode characteristics. The power source has what is termed a ‘drooping’ or constant current characteristic (Fig. 3). This means that a change of arc length (which controls voltage) will have only a small effect on the welding current as follows: . 3 Constant current characteristic decreases. The current decrease is very small and will have little effect on the burn-off rate of the electrode.

Remember that oxy-fuel gas cutting does not actually melt and blow away the molten material like plasma or oxy arc cutting does. What it actually does is to heat up the material to its ignition temperature and then introduces a stream of oxygen, turning the metal into instant rust, which is then blown away. This is why stainless steel (a rust-resistant material) cannot be cut by oxy-fuel gas unless special powders are added to the process. 3d Page 26 of 35 Analysis of a Fusion Weld . If mechanical cutting such as machining (normally required for weld joint preparations containing a radius such as a U or J prep) or shearing is used then consideration must be given to the possibility of having cutting fluids trapped in the cut edges.

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A Quick Guide to Welding and Weld Inspection by S E Hughes


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