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

By S E Hughes

A concise and available advisor to the information required to fulfil the position of a welding inspector. In overlaying either ecu and US-based codes, the ebook offers these wishing to realize certification in welding inspection a uncomplicated all-round figuring out of the most topic matter.

  • A concise and available consultant to the data required to fulfil the function of a welding inspector
  • Covers either ecu and US-based codes
  • Gives these wishing to achieve certification in welding inspection a simple all-round figuring out of the most topic matter

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Additional info for A Quick Guide to Welding and Weld Inspection (Woodhead Publishing Series in Welding and Other Joining Technologies)

Sample text

Thermal expansion and conductivity of a duplex stainless steel are between that of carbon steel and austenitic stainless steel. The operating temperature is normally kept below 300 8C to avoid a degradation mechanism called ‘475 8C embrittlement’. Typical defects . The problems most typical of duplex stainless steels are associated with the heat affected zone (HAZ) rather than the weld metal. The HAZ can suffer from: ○ loss of corrosion resistance; ○ loss of toughness; ○ post-weld cracking. The duplex structure is very sensitive to contaminants, particularly moisture.

The ferrite in a duplex weld metal is typically in the range of 25 to 60%. In some welding processes utilising a flux, the phase balance of the filler is biased to increased austenite to offset the loss of toughness associated with oxygen pickup from the flux. Thermal expansion and conductivity of a duplex stainless steel are between that of carbon steel and austenitic stainless steel. The operating temperature is normally kept below 300 8C to avoid a degradation mechanism called ‘475 8C embrittlement’.

Artificially aged alloys are tempered at elevated temperature, while naturally ageing alloys may be tempered at room temperature. Some superalloys may be subjected to several tempering operations where a different precipitate is formed during each operation. 3d Page 47 of 48 A Quick Guide to Welding and Weld Inspection are difficult to drive back into solution. This contributes to the high temperature strength of precipitation hardened superalloys. Stress relief The primary function of post-weld heat treatment (PWHT) stress relief is to relieve internal stresses in welded fabrications by permitting the steel to creep slightly at an elevated temperature.

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