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S E Hughes's 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 booklet supplies these wishing to achieve certification in welding inspection a simple all-round knowing of the most topic matter.

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

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Additional resources for A Quick Guide to Welding and Weld Inspection

Sample text

In reality, the shrinkage and distortion will follow a very complex pattern but a simplified exaggerated view of the effects is shown in Fig. 5. The shape of a weld preparation will affect how much distortion is produced, because bevel angles will help to direct the distortion direction. The material thickness, amount of weld metal required and size of individual weld runs also affect stress and distortion levels. A single V butt will suffer considerable distortion, especially during the initial root runs when there is no restraint, because of the high level of weld metal shrinkage.

Improper welds might be less corrosion-resistant compared to the base metal. Reaction with gases and fluxes makes common welding processes such as gas welding, MMA, FCAW and SAW unsuitable. Typical imperfections Titanium welding imperfections are: . Porosity, caused by gas bubbles trapped during solidification. The gas is hydrogen from moisture in the arc environment or from contamination on the filler and/or parent metal surface. Contamination cracking, caused by iron particles present on the material surface dissolving in the weld metal and reducing its corrosion resistance.

3d Page 40 of 48 Materials and Their Weldability gas absorption (due to poor shielding) or by dissolving contaminants such as dust (iron particles) on the surface. On the positive side, solidification cracking and hydrogen cracking are not normally found in titanium or its alloys. A thin layer of surface oxide generates an interference colour at the weld that can indicate whether the shielding was adequate or not. Typical colours are as follows: . Silver or light straw is acceptable. Dark blue may be acceptable for certain service conditions.

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


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