Arc Welding Processes Handbook. Ramesh Kumar Singh

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      1.6.1 Carbon Arc Welding

      The carbon arc welding (CAW) process is the oldest of all the arc welding processes and is considered to be the beginning of arc welding. The Welding Society defines carbon arc welding as “an arc welding process which produces coalescence of metals by heating them with an arc between a carbon electrode and the work-piece. No shielding is used. Pressure and filler metal may or may not be added. It has limited applications today, but a variation or twin carbon arc welding is more popular. Another variation uses compressed air to force molten metal out to effect cutting.

      1.6.2 Shielded Metal Arc Welding (SMAW)

The development of the metal arc welding process soon followed the carbon arc. This developed into the currently popular shielded metal arc welding (SMAW) process defined as, an arc welding process which produces coalescence of metals by heating them with an arc between a covered metal electrode and the work-piece. Shielding is obtained from decomposition of the electrode covering. Pressure is not used and filler metal is obtained from the electrode.

Figure 1.1 General lay out of welding and joining processes.

      1.6.3 Gas Tungsten Arc Welding (GTAW)

      The need to weld nonferrous metals, particularly magnesium and aluminum, challenged the industry. A solution was found called gas tungsten arc welding (GTAW) and is defined as, an arc welding process which produces coalescence of metals by heating them with an arc between a non-consumable tungsten electrode, and the work piece. Shielding for the welding arc is obtained often from an inert-gas, or mixture gases that may not always be inert.

Table 1.1 Welding and joining processes, type of energy used, and their abbreviations as defined by the American Welding Society.

Group	Welding process	AWS letter designation
Arc Welding
Electric Arc Welding	Carbon Arc	CAW
	Flux Cored Arc	FCAW*
	Gas Metal Arc	GMAW*
	Gas Tungsten Arc	GTAW*
	Plasma Arc	PAW**
	Shielded Metal Arc	SMAW*
	Stud Arc	SW
	Submerged Arc	SAW*
Electrical Resistance Welding	Flash Welding	FW
	High Frequency Resistance	HFRW
	Percussion Welding	PEW
	Projection Welding	RPW
	Resistance-Seam Welding	RSEW
	Resistance-Spot Welding	RSW
	Upset Welding	UW
Oxy-fuel Gas Welding (OFW)
	Oxyacetylene Welding	OAW
	Oxyhydrogen Welding	OHW
	Pressure Gas Welding	PGW
Solid State Welding
	Cold Welding	CW
	Diffusion Welding	DFW
	Explosion Welding	EXW
	Forge Welding	FOW
	Friction Welding	FRW
	Hot Pressure Welding	HPW
	Roll Welding	ROW
	Ultrasonic Welding	USW
Capillary Action Transfer and Distribution of Metal
Brazing	Diffusion Brazing	DFB
	Dip Brazing	DB
	Furnace Brazing	FB
	Induction Brazing	IB
	Infrared Brazing	СКАЧАТЬ В начало < 10 11 12 13 14 15 16 17 18 19 > В конец