Preheating for Transition joint ( Different thickness )

Applicable standard : AWS D1.1 Reference table: Table 3.3 ( Prequalified Minimum Preheat and Interpass Temperature) Generally, WPS is only indicating a Preheating temperature for the joint with equal wall thickness. Sometime, you can meet this circumstance in heavy structure welding as detailed by three basic types as above image (A,B,C) In AWS D1.1 Table … Continue reading Preheating for Transition joint ( Different thickness )

What is Welding Preheating ?

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 … Continue reading What is Welding Preheating ?

CSWIP 3.1: What is OCV ( Open Circuit Voltage ) in welding power source?

In this topic we will talk about OCV in welding power source. We need to solve some question to clear this topic: What is OCV? Types of static characteristic of power source? How to identify? How to know which welding process use what type of it ( CC or CV )? … 1) What is … Continue reading CSWIP 3.1: What is OCV ( Open Circuit Voltage ) in welding power source?