Lead (Pb)

CAUTION Lead dust and fumes are poisonous. Exercise extreme care when welding lead, and use personal protective equipment. Lead is a heavy, soft, malleable metal with a low melting point, low tensile strength, and low creep strength. It is resistant to corrosion from the atmosphere, moisture, and water, and is effective against many acids. It is … Read more

Physical Properties Of Metals

Many of the physical properties of metals determine if and how they can be welded and how they will perform in service. The physical properties of various metals are shown in table 7-1. Color. Color relates to the quality of light reflected from the metal. Mass or density. Mass or density relates to mass with respect to volume. … Read more

Tungsten Electrodes

Non-consumable tungsten electrodes for GTAW (Gas Tungsten Arc Welding)  or TIG (Tungsten Inert Gas) welding, generally are of several types. Tungsten electrodes types and their typical application can be identified by color-coded end marks as follows. Pure Tungsten :  Green 2% Ceriated :  Gray 2% Thoriated : Red 2% Zirconiated : Brown 1.5% Lanthanated : Gold 2% Lanthanated … Read more

Mechanical Properties Of Metals

The mechanical properties of metals determine the range of usefulness of the metal and establish the service that can be expected. Mechanical properties are also used to help specify and identify metals. They are important in welding because the weld must provide the same mechanical properties as the base metals being joined. The adequacy of a weld … Read more

Flux-cored Arc Welding Electrodes

The electrodes used for flux-cored arc welding provide the filler metal to the weld puddle and shielding for the arc. Shielding is required for sane electrode types. The purpose of the shielding gas is to provide protection from the atmosphere to the arc and molten weld puddle. The chemical composition of the electrode wire and flux core, … Read more

Metal Tests: How to Identify Metals for Welding

Metal tests enable us to identify metals for welding It is necessary to know the composition of the metal being welded in order to produce a successful weld. Welders and metal workers must be able to identify various metal products so that proper work methods may be applied. For equipment, drawings (MWOs) should be available. … Read more

Low Carbon Steels: Welding Mild Steel

The low carbon (mild) steels include those with a carbon content of up to 0.30 percent (fig. 7-7). In most low carbon steels, carbon ranges from 0.10 to 0.25 percent, manganese from 0.25 to 0.50 percent, phosphorous 0.40 percent maximum, and sulfur 0.50 percent maximum. Steels in this range are most widely used for industrial fabrication and … Read more

Welding Carbon Steel

Welding Low Carbon Steel For welding low carbon steel with the metal-arc welding process, the bare, thin coated, or heavy coated shielded arc types of electrodes may be used. These electrodes are of low carbon type (0.10 to 0.14 percent). Low carbon sheet or plate materials that have been exposed to low temperatures should be preheated … Read more

Welding Tin The Right Way

(a) General. Tin is a very soft, malleable, somewhat ductile, corrosion-resistant metal having low tensile strength and high crystalline structure. It is used in coating metals to prevent corrosion. (b) Uses. The major application of tin is in coating steel. It serves as the best container for preserving perishable focal. Tin, in the form of foil, is … Read more

Welding Magnesium – Here’s How To Do It Effectively

***Welding magnesium. ***Magnesium is a white, very lightweight, machinable, corrosion-resistant, high strength metal. It can be alloyed with small quantities of other metals, such as aluminum, manganese, zinc, and zirconium, to obtain desired properties. It can be welded by most of the welding processes used in the metalworking trades. Because this metal oxidizes rapidly when … Read more