Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
WELDER PERFORMANCE QUALIFICATIONS
Requirement of Welder QualificationIn performance qualification, the basic attempt is to establish the ability of the welder to deposit sound metal. In case of welding operator qualification it is his mechanical ability to operate the welding machine that is tested and acknowledged.During welder's qualification, only the essential variables (as applicable to welder's skill) are considered and production welds with such altered variables should not be continued without additionally qualifying the welders. A welding machine operator usually gets qualified along with procedure test. Additional qualifications are to be suitably enforced as and when certain essential variables are not meeting.Codes for Performance Qualifications and Acceptance of DefectsA large number of industrial codes now a days recognise prequalified welding procedures as t he manufacturing firms are able to produce the documentary evidence for such procedures as in vogue in their organisations. The selection, training and qualification of welders are the next few steps. Some of the popular codes to look for, at this juncture are:
There are also number of other specifications for welder testing, pertaining to individual codes of construction. A welder's plate test coupon can be maximum 300 mm x 400 mm with appropriate thickness to cover the allowed, specified thickness ranges. Similarly 2 pipes (or tubes) having a maximum of 125 mm length each are joined together for a pipe weld test coupon.The test coupons are then subjected to radiography testing. Welders are outrightly failed for the following indications in the radiographic film. All other defects are acceptable within limits.1. Severe root porosites / blow holes2. Cluster of porosites3. Cracks4. Lack of fusion / incomplete penetrationAfter necessary post weld heat treatment the plates or pipes are marked, stamped, cut and machined into mechanical test specimens. Though, the requirements of the codes are slightly varied, 2 face bend tests and 2 root bend t ests alone are conducted for performance qualifications. In lieu of the above a radiographic evaluation is done.
EQUIPMENT FOR RESISTANCE WELDING-Measurements Measurement of the parameters are important while fixing the parameters or testing a machine. Resistance welding instrumentation s
Q. What is Pre-fabricated buildings? Buildings: Pre-fabricated buildings shall be as per specification GS-904-0520 and, when provided, conceptual drawings prepared by Engine
A copper-silver bimetallic wire, 1 cm in diameter, is prepared by co-extrusion with copper as the core and silver as the outer layer. The desired properties along the axis parallel
Question Suppose T 1 and T 2 are independent and identically distributed Exponential variables with common hazard λ. What is the density of T = T 1 + T 2 ? What is the E(T-1
Explain lami's theorem: Sol.: Lami's theorem states that "If the three coplanar forces which are acting at a point be in equilibrium, then every force is proportional to sin
what is moment of resistance?
Define Electro Discharge Machining In Electro-discharge machining (E.D.M) process the metal is removed from the work piece due to erosion caused by rapidly recurring spark
Question: As shown in the figure, the jet transport B is flying north with a velocity V B = 600 Km/h when a smaller aircraft A passes underneath the transport headed in the 60
Q. What is Precipitation? Precipitation includes rain, snow and hail. The maximum, average, and storm volumes will have an impact on the size and positioning of facilities to c
Describe the internal structure, bonding of atoms and molecules and to understand the mechanical properties of materials. Comprehensive understanding of properties of materials, at
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd