Difference between Pipe and Tube

Dear Readers,

From a layman’s viewpoint, Both Pipe and Tube seem to be the same as they have many similarities like both are hollow, made from metals, both can transfer fluids, etc. However, there are significant differences between pipe and tube.

The difference between pipe and tube is marginal. They differ in the way they are sized. The pipe is generally specified by the internal diameter (ID) whereas tube is specified by the outside diameter (OD), but its dimensions may be given as a combination of ID, OD and the wall thickness.

What is Pipe?

Pipe is a hollow section with round cross section. Always cylindrical or round in shape for the conveyance of products. The products include fluids, gas, pellets, powders and more.

What is Tube?

Tube in general, cylindrical. However, refers to round, square, rectangular and oval hollow sections that are used for pressure equipment, for mechanical applications, and for instrumentation systems.

Unit Weight of Hex Bolt and Nut

 A bolt contains two parts a shank and head. The cylindrical portion of the bolt is known as the shank. The shank is threaded at the tail end for a sufficient length so as to effectively engage with a nut.

The shape of the head is depended upon the purpose for which bolt is required. The nut is a type of a fastener which has a threaded hole in it. The nut is always used in joining with a mating bolt to fasten various parts together.

Bolts and nuts can be made of various materials such as steel, titanium or plastic. The finish or plating on a metal bolt or nut affects its look and durability. Below are some common finishes and benefits:

• Zinc - Most common, low cost, resists corrosion and rust

• Nickel - Very hard finish, higher investment, good corrosion resistance

• Chromium – Bright finish, good rust and corrosion resistance

• Chromate – Adds color, shine, superior rust resistance

• Anodizing - Aluminum, hard oxide surface, excellent corrosion resistance

Generally purchasing of fasteners are in Kilograms instead of pieces. But we could not know how many numbers available per Kg. For construction purpose, Bulk purchase is advisable. Hence below count table will be useable. Counts are based on 50Kg

For More Information about Grade of Bolts Click Here

For More Information about Torque Clique Here

TIG Welding

Tungsten Inert Gas (TIG) Welding

TIG Welding is also a slang term commonly used. Tungsten inert gas welding (TIG welding) is a gas shielded welding process and is one of the fusion welding processes. TIG welding’s proper name is Gas Tungsten Arc Welding or “GTAW". This is the name the American Welding Society and other welding organizations refer to this process on their welding procedures. TIG welding also goes by the term HeliArc welding.

When TIG welding was introduced around the 1940’s Helium gas was the primary shielding gas used in process. The term Heliarc welding was the common phrase used back in the day Most old timers and veteran welders refer to TIG welding as Heliarc welding.

Since the name includes the term “Tungsten" and tungsten is what makes TIG welding possible, it is good to know what tungsten is! Tungsten is a very hard, slightly radioactive, and brittle metal. At 3380 degrees Celsius, tungsten has the highest melting point of all pure metals in the periodic system. This means that the electrode does not melt when it emits an arc that heats and liquefies the material. In TIG welding the tungsten is made into a non-consumable electrode that is used to create the arc for TIG welding.

THIS IS HOW A TIG WELDING SYSTEM IS STRUCTURED:

(1) Mains connection

(2) Power source

(3) Hose pack

(4) Grounding cable

(5) Welding torch

(6) Ground terminal

(7) Workpiece

(8) Filler metal

(9) Shielding gas

TIG welding requires three things, heat, shielding, and filler metal. The heat is produced by electricity passing through the tungsten electrode by creating an arc to the metal. The shielding comes from a compressed gas cylinder that flows to the weld area to protect it from air. The filler metal is just a wire that is dipped by hand into the arc and melted.

TIG Welding is a manual welding process that requires the welder to use their both hands to weld. When TIG Welding one hand is used for holding the TIG torch that produces the arc and the other hand is to add the filler metal to the weld joint.

Shielding gas is selected according to the material being welded. Argon - the most commonly-used shielding gas. Helium and helium/argon mixtures - adding helium to argon will raise the temperature of the arc. This promotes higher welding speeds and deeper weld penetration.

In the TIG welding process the arc is formed between a pointed tungsten electrode and the workpiece in an inert atmosphere of argon or helium. TIG welding must be operated with a drooping, constant current power source - either DC or AC.

ADVANTAGES OF TIG WELDING

No formation of welding spatter

Particularly high optical quality of weld seams

All welding positions are possible

Very high weld seam quality

DISADVANTAGES OF TIG WELDING

Requires high degree of skill

Low welding speeds

Rust must be removed without fail when preparing the weld seam

Not suitable for thick workpieces