What is the difference between pipe and tube?

One of the things that engineers in all industries will have to deal with it somehow, and one of the fundamental issues is complete understanding of the difference between pipes and tubes, be. Attempt has been made to this topic differences between pipes and tubes are examined in detail and examples. The article by Mr. Ebrahim No, Inspection Engineer Iranian Offshore Oil Company (Bahregan area) has been prepared. 

Principles governing the choice of electrode

Principles governing the choice of electrode


The amount and type of electrode, the weld must be at least equal to the base metal .

Apart from the electrodes, carbon electrodes, hard cover should be less than 0.15% by weight .

For metals with a high of 0.35% carbon electrodes in alkaline 're only allowed to use .

For thicknesses up to speed and reduce residual stresses from welding electrodes used Bajaygzyny above .

Macroscopic cracks due to load

Macroscopic cracks due to load

Visual inspection

Recipe! visual inspection (VT) 

• Target 

• The development of these guidelines and rules for the inspection and control of food products before - during - and after the welding process is in terms of visual appearance. 

• scope 

• Scope This instruction covers the installation and repair of all welding processes are. 

  

Weld Cracking

Weld cracking

Different types of connectors may be placed in the weld or heat affected zones occur. Welds may contain porosity, slag or Khalhay are all Turks . Khalhay weld porosity and slag may be acceptable to some extent , but never cracks in welds are not acceptable . Cracks in the weld or near the weld indicates that probably there is a problem at work . Turks examination to determine the cause and ways to prevent them Ajad makes them for us . First, we should note that we distinguish between crack and break . To our left , a phenomenon that is caused by factors such as freezing , cooling and internal stresses due to shrinkage of the weld is created . Turkish hot cracking , which are occurring at high temperatures and are usually associated with freezing .

Welding under Water

Background : More than one hundred years of the arc and are used worldwide . But first underwater welding was done by the British Navy - at that time a shipyard in order to seal the leaking ship rivets below the water had been used of underwater welding . In productive work that is done under water , underwater welding is considered a key tool . In 1946 , a special waterproof electrodes was developed in the Netherlands by Van Vylyjn 1 . Cross- shore structures such as offshore drilling oil wells , pipelines and platforms are constructed in particular water , have increased dramatically in recent years . Some of its elements or structural defects in disasters such as hurricanes will experience . Among these structures require any repair method used in underwater welding .

Welding defects

Welding defects

Introduction

Such materials and metal forming and welding metallurgical terms of donor and recipient must have appropriate characteristics , so welding should be considered in terms of metallurgical physical metallurgy and welding two pieces of functionality that you specify ? The ability of metallurgy , who created the piece , in terms of mechanical function and healthy ? Can you facility for specific requirements, the welding machine to create a gas and the assumption of power generated at high temperatures or low temperatures may be hitting ? Standards because of the mechanical and industrial engineering and welding must be adhered to in all cases without fracture porosity and penetration weld slag , etc. should be done . Repetition of specialized welding , and in principle to all types of welding, welding can be should be the exact metals . Intermediate materials and electrode welding powder , must be careful enough . The environment before and during welding , and after welding as in the case of iron, should be created.