ENGG434 Introduction to Materials Welding and Joining

Reference no: EM132380670

ENGG434 Introduction to Materials Welding and Joining Assignment - School Of Mechanical, Materials, Mechatronic and Biomedical Engineering - University of Wollongong, Australia

QUESTION: The transportation of liquefied natural gas (LNG) is a major shipping activity worldwide. The gas is liquefied at a temperature of -161.5^oC to reduce its volume, and transported in pressurised tanks manufactured from low temperature materials. You are required to develop a welding procedure specification (WPS) for joining two dissimilar metals. In this assignment a low temperature cryogenic steel containing 3½% nickel has to be welded to type AISI 316L stainless steel. Assume a plate thickness of 20 mm and note that distortion control and joint toughness are critical in this application. The nominal compositions of the base materials are given in the table below.

You have to use the library and other sources of information to identify any difficulties associated with this particular dissimilar metal combination, to identify particular defects that may form, and to gain a thorough understanding of the metallurgy of the joint. You then have to design a welding procedure, with special emphasis on the following:

Joint design
Welding sequence
Welding process
Process variables
Consumables
Preheat and interpass temperature control
Post-weld heat treatment

Each student will be required to submit the welding procedure specification and a short report describing how you arrived at this welding procedure, motivating your choices and any assumptions made (a maximum of 2500 words, excluding references). For your information, a WPS template from EN 288-2:1992 is attached.

Alloy	C	Mn	Cr	Si	Ni	Mo
3½% Ni steel	0.17	0.7	-	0.30	3.5	-
AISI 316L	0.03	1.5	18.0	0.75	12	2.5

Attachment:- Materials Welding and Joining Assignment File.rar

Reference no: EM132380670

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