Sunday, September 18, 2011

Rudiments of Stick Welding


In welding jargon stick welding is a nickname for Shielded Metal Arc Welding (SMAW) or Arc Welding. The name stick welding is the result of the stick like appearance of the electrode that forms the crust of arc welding. There are 5 most basic aspects that can be very influential in deciding the effectiveness of the process. They are what we call as CLAMS.

CLAMS should be expanded as

C - Current setting

L - Length of arc

A - Angle of travel

M - Manipulation

S - Speed of travel

Current setting - Electrode and its type influences the decision of selecting the appropriate current of amperage. Operating ranges can be read from the display at the side of the electrode box. The newest machines do bear with them a label that suggests you appropriate amperage values for the list of electrode thicknesses that are most often use.

Length of arc - Longer lengths lead to excess spatter and undercuts too. Choose a length that is most appropriate to the electrode that you have decided to use for the specific task. Avoid holding the electrode way too close as it leads to a sharp decrease in voltage. Newbie make a mistake of holding the electrode too far and produce a lot of spatter. Constant practice will teach you that controlled and tight length of arc will result in minimal spatter and great beads.

Angle of travel - Perpendicular position will lead to great beads.

Manipulation - It is wise to build up on the basics that you have acquired. But the basics should be strong as this is what can take you places as a professional welder. With keen observance and innovation at your leisure will eventually give you your own style of performing the job.

Speed of travel - Continually maintaining the same speed of travel will give you good beads. However you have got to alter the speed to make the arc stay within the specific area. High speeds will produce high crowns and undercuts too. They are not efficient when it comes to penetration too.

Most important of these all, be open and prepared to accept your mistakes. No one person has mastered the art without any errors whatsoever. But try to keep your view strictly to the puddle. Make necessary arrangements so that you get a clear view of the puddle. Be calm and learn from your mistakes. That is the best that you can do as the first step towards learning. Also learn to re-weld you mistakes away. They are useful to keep wastage to a minimum. Keep yourself away from the harm that a machine is capable of and strictly adhere to the safety precautions that should be followed while performing these risky tasks.


Specification for Low Alloy Steel Covered Arc Welding Electrodes

WHAT IS LATENT DEMAND AND THE P.I.E.?

The concept of latent demand is rather subtle. The term latent typically refers to something that is dormant, not observable, or not yet realized. Demand is the notion of an economic quantity that a target population or market requires under different assumptions of price, quality, and distribution, among other factors. Latent demand, therefore, is commonly defined by economists as the industry earnings of a market when that market becomes accessible and attractive to serve by competing firms. It is a measure, therefore, of potential industry earnings (P.I.E.) or total revenues (not profit) if a market is served in an efficient manner. It is typically expressed as the total revenues potentially extracted by firms. The “market” is defined at a given level in the value chain. There can be latent demand at the retail level, at the wholesale level, the manufacturing level, and the raw materials level (the P.I.E. of higher levels of the value chain being always smaller than the P.I.E. of levels at lower levels of the same value chain, assuming all levels maintain minimum profitability).

The latent demand for hard-facing metal arc welding stick electrodes is not actual or historic sales. Nor is latent demand future sales. In fact, latent demand can be lower either lower or higher than actual sales if a market is inefficient (i.e., not representative of relatively competitive levels). Inefficiencies arise from a number of factors, including the lack of international openness, cultural barriers to consumption, regulations, and cartel-like behavior on the part of firms. In general, however, latent demand is typically larger than actual sales in a country market.

For reasons discussed later, this report does not consider the notion of “unit quantities”, only total latent revenues (i.e., a calculation of price times quantity is never made, though one is implied). The units used in this repor

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