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
why constant volume line has more slop tha constant pressure line in T-S diagram

how can we calcute the length of dip tube and what are its effects on cyclone efficiency if we change its length


In a Rankine cycle, the steam at inlet to turbine is saturated at a pressure of 35 bar and the exhaust pressure is 0.2 bar. Evaluate: (i) The pump work, (ii) The turb


howto calculate area in hysteresisn..

Explain the meaning of A raft foundation A raft foundation, as also combined footing, cannot be considered to be the opposite of a slab supported on the columns with a defined

(a) Illustrate Kinematics Links, Chin, Mechanism and Pair with their classification and examples. (b) Compare between structure and Machine.

Three Particle System Suppose we have two particles of masses  m 1  and  m 2   already fixed in space at distance  r 12  from each other. Let us bring in a third particle of

Q. What is Bolt Elongation? The required bolt elongation Δ 1 may be calculated by the equation (7): Δ 1 = 3.25 * 10-8 * SB * L0 (in) (7) Where L 0 is the effect