Pre heat interpass temp. requirements for filler metals, Mechanical Engineering

PRE HEAT INTERPASS TEMP. REQUIREMENTS FOR FILLER METALS

The preheat and inter pass temperature must be sufficient to prevent the  cracking.Previous  Experience has shown that the minimum temperatures specified in are adequate to prevent cracking in many  cases. However the increased preheat temperatures may be necessary in situations involving higher restraint higher hydrogen,  & lower welding heat input or steel composition at the top end of the specifications. In converse, lower preheat temperatures may be adequate to prevent cracking depending on restraint, hydrogen level, & actual steel composition or higher welding heat input.

Optionally, minimum preheat and interpass temperature may be established on the basis of steel composition, using recognised methods of prediction or guidelines. However should the use of these guidelines result in preheat temperatures lower than those of  procedure qualification shall be required. Preheat shall be applied such that the surfaces of the parts are at or alone the preheat temperature for a distance equal to the thickness of the part being welded but not less than 75 mm in all directions. In joints involving combinations of base metals preheat shall be specified for the higher strength steel being welded.

Posted Date: 9/18/2012 2:18:02 AM | Location : United States







Related Discussions:- Pre heat interpass temp. requirements for filler metals, Assignment Help, Ask Question on Pre heat interpass temp. requirements for filler metals, Get Answer, Expert's Help, Pre heat interpass temp. requirements for filler metals Discussions

Write discussion on Pre heat interpass temp. requirements for filler metals
Your posts are moderated
Related Questions
WHAT IS DAMP VIBRATION FACE ANGLE SIMPLE HARMONIC MOTION NATURAL CIRCULAR FREQUENCY FORCE VIBRATION

Complete the following problem from the text by Megson.  Note that since the answers are given, it is essential that you show and justify all work to receive full credit.  Required

Calculate the Horizontal and Vertical Components A jet aircraft pulls up into a vertical curve as shown in the figure. As it passes the position where Θ = 30°, its speed is 10

Case study entitled " Exxon Valdez Oil Spill Disaster ". 1.      Examine the aim and objectives of Exxon Mobil Corporation. 2.      Carefully observe the oil and refinery ind

Calculation for Stress-strain carves:   After reaching point D, if bar is strained further, a local reduction in cross section occurs in gauge length (that is, formati

Industrial Manufacturing Activity can broadly be divided into the followings ways: Mass Production Large lots e, g, Automobiles : In this the volume of production is very hi

what are the complications of a binary vapour cycle?

Annotation with Leaders Ordinate dimensions are not really an dimensions at all in that they do not indicate a measurement.They annotate known as a co-ordinate points. The DIMO

Pressure Vessel materials shall be as specified on the Vessel Data Sheet. All attachments to vessels shall be of the same ‘P Number' material as that for the pressure envelope,

what is tooling economics, machine economics and optimization