Category: WELDING

CSWIP 3.0/3.1/3.2, Metallurgy, WELDING2 Comments

What is Welding Preheating ?

Amarine Antonio

The phenomenon of heating the joint in the weld zone before the commencement of welding procedure is known as pre-heating. Normally it is applied by the use of ovens, flame producing torch, resistive heating elements and high frequency heating elements. It helps to eliminate welding interruption and several imperfections and set the joining phenomenon on smooth track. Why to use Pre-heat ? Following are the main reasons for using the pre-heat in a welding procedure. The use of Pre-heat, eliminates the surface moisture; consequently reducing the hydrogen induced cracking. It tweaks fusion and deposition of weld metal in a better … Continue reading What is Welding Preheating ?

WELDING2 Comments

How to take the welding parameters during make WPS / monitor welding performance?

Thanh ( QC ) Nguyen Le

To confirm that a weld has been made to specification: For arc welding the main parameters are as follows: Welding current Arc voltage Travel speed The other parameters which may be measured and recorded are as follows: Wire feed speed (for MIG/MAG) and other processes with a filler wire Gas flow rate (shielding, backing and plasma) Temperature (pre-heat, inter-pass and post-weld heat treatment) Some of these instruments allow the length of the weld to be input so that arc energy (kJ/mm) can be calculated. When measuring voltage and current it is important to do so correctly. + Although current can be … Continue reading How to take the welding parameters during make WPS / monitor welding performance?

AWS D1.1 & ASME IX, WELDINGLeave a comment

ISO 15614 Part 1 and ASME IX

Amarine Antonio

The two most frequently encountered to welding procedure specifications are ISO 15614 Part 1 and ASME IX and whilst these are written with the same purpose. There are major differences between the two specifications that mean that they are not equivalent. It will not be possible in this short article to cover every welding variable and its range of approval in the two specifications. Where compliance is required then reference MUST be made to the appropriate specification. With respect to ASME IX the specification requirements can be applied in two ways; ASME intent and ASME stamp. If the welded item … Continue reading ISO 15614 Part 1 and ASME IX

CSWIP 3.0/3.1/3.2, WELDING1 Comment

Thread of Bolts – Basic Knowledge

Thanh ( QC ) Nguyen Le

When checking Bolt material coming, do you have feeling lose in the forest of BOLT & THEARD? We will help you to identify them accordingly via this topic! It has internal thread & external thread, can call male & female also. 1)  Thread direction: The helix of a thread can twist in two possible directions.: left hand & right hand. 2) Technical terms of thread: Type of thread: Pitch / TPI ( thread per inch ): – The pitch is the distance from the top of one thread to the next in mm. – TPI (Threads per inch) is used by … Continue reading Thread of Bolts – Basic Knowledge

CSWIP 3.0/3.1/3.2, WELDING9 Comments

CSWIP 3.1: Question with Answer and Explanation – Part 20

Thanh ( QC ) Nguyen Le

CSWIP 3.1 QUESTION AND ANSWER SERIES 1) A solid inclusion in a welder may be: Entrapped slag.  (answer) Entrapped gas. Lack of inter-run fusion. None of the above. This is “solid” not gas! 2) Which is the following is a planar imperfection? Lack of sidewall fusion.  (answer) Slag inclusion. Linear porosity. Root concavity. 3) For fillet welds it is normal practice in the UK and USA measure: Throat thickness. Leg lengths. ( answer ) Penetration depths. Both 1 and 3. Measure “Leg lengths” is easy checking on site. 4) Heavy porosity on the surface of some MMA welds made on … Continue reading CSWIP 3.1: Question with Answer and Explanation – Part 20

CSWIP 3.0/3.1/3.2, WELDING2 Comments

CSWIP 3.1: Question with Answer and Explanation – Part 19

Thanh ( QC ) Nguyen Le

CSWIP 3.1 QUESTION AND ANSWER SERIES CSWIP 3.1: Question with Answer and Explanation – Part 1 CSWIP 3.1: Question with Answer and Explanation – Part 2 CSWIP 3.1: Question with Answer and Explanation – Part 3 CSWIP 3.1: Question with Answer and Explanation – Part 4 CSWIP 3.1: Question with Answer and Explanation – Part 5 CSWIP 3.1: Question with Answer and Explanation – Part 6 CSWIP 3.1: Question with Answer and Explanation – Part 7 CSWIP 3.1: Question with Answer and Explanation – Part 8 CSWIP 3.1: Question with Answer and Explanation – Part 9 CSWIP 3.1: Question with … Continue reading CSWIP 3.1: Question with Answer and Explanation – Part 19

CSWIP 3.0/3.1/3.2, WELDING1 Comment

CSWIP 3.1: Question with Answer and Explanation – Part 18

Thanh ( QC ) Nguyen Le

CSWIP 3.1 QUESTION AND ANSWER SERIES CSWIP 3.1: Question with Answer and Explanation – Part 1 CSWIP 3.1: Question with Answer and Explanation – Part 2 CSWIP 3.1: Question with Answer and Explanation – Part 3 CSWIP 3.1: Question with Answer and Explanation – Part 4 CSWIP 3.1: Question with Answer and Explanation – Part 5 CSWIP 3.1: Question with Answer and Explanation – Part 6 CSWIP 3.1: Question with Answer and Explanation – Part 7 CSWIP 3.1: Question with Answer and Explanation – Part 8 CSWIP 3.1: Question with Answer and Explanation – Part 9 CSWIP 3.1: Question with … Continue reading CSWIP 3.1: Question with Answer and Explanation – Part 18

CSWIP 3.0/3.1/3.2, WELDING1 Comment

CSWIP 3.1: Question with Answer and Explanation – Part 16

Thanh ( QC ) Nguyen Le

  CSWIP 3.1 QUESTION AND ANSWER SERIES CSWIP 3.1: Question with Answer and Explanation – Part 1 CSWIP 3.1: Question with Answer and Explanation – Part 2 CSWIP 3.1: Question with Answer and Explanation – Part 3 CSWIP 3.1: Question with Answer and Explanation – Part 4 CSWIP 3.1: Question with Answer and Explanation – Part 5 CSWIP 3.1: Question with Answer and Explanation – Part 6 CSWIP 3.1: Question with Answer and Explanation – Part 7 CSWIP 3.1: Question with Answer and Explanation – Part 8 CSWIP 3.1: Question with Answer and Explanation – Part 9 CSWIP 3.1: Question … Continue reading CSWIP 3.1: Question with Answer and Explanation – Part 16