TIG....how exactly does it work?
Joined: Mar 2004
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From: Auckland, NZ, New Zealand
https://honda-tech.com/zerothread?id=1022836
The TIG (Tungsten Inert Gas) welding process (also known as gas tungsten arc welding, GTAW, or HELIARC, a trade name of Linde) generates heat from an electric arc maintained between a non consumable tungsten electrode and the part being welded. This process was developed for the aircraft industry back in the early '40s. TIG may be used without the addition of a filler metal or a separate wire filler metal can be added into the puddle when additional material is required, much like the process in oxy-acetylene welding. The puddle, the tungsten electrode and the filler rod are protected from atmosphere by a shield of inert gas to prevent rapid oxidation of the weld and surrounding metal. Argon is the most widely utilized gas. Because the gas shield does not produce the slag that normally is created by flux, the danger of slag inclusion in the weld metal is eliminated. Also, due to the slow speed of the TIG process, gases and other impurities escape to the surface of the puddle before solidification occurs, eliminating pockets called "Porosity" common in weld processes that employ gas shielding but have greater travel speeds than the TIG process. TIG also produces a welding heat is that is confined between the weld and base metal at the point of fusion and produces a narrow heat affected zone. This reduces stress, cracking and distortion in the finished weld. Spatter is not produced by this process, leaving the weld and surrounding metal clean. Because of the lack of spatter and flux smoke, the TIG process allows the operator a clear view of the weld puddle. The torch body in most cases is small enough that the operator can hold it in the same manner as he would hold a pencil allowing easier manipulation. The power source is constant current, either AC, DC, or combination AC/DC. Type of metal determines which type is used. DC (direct current) is most normally used for TIG welding of stainless steels and mild and low alloy steels. AC (Alternating current) is used for TIG welding of aluminum. Surface oxidation is automatically removed by the action of the arc each time the electrode becomes positive, (60 times per. second). Because AC crosses over the zero volt point 120 times per second (once going positive and once going negative each cycle), the arc shuts off 120 times per second. To keep the arc going when using AC, a high frequency "arc stabilizer" is used. The high frequency also allows the start of an arc in DC mode without having to "strike" an arc, thereby reducing the possibility of tungsten contamination. If the electrode accidentally touches the weld pool, it becomes contaminated and must be cleaned immediately to prevent weld contamination. TIG requires an extremely clean surface to weld successfully and is a fairly slow operation. On the plus side, TIG produces high quality work and does not generate slag or spatter. The welder can adjust the heat input while welding by using foot or hand amperage controls.
The TIG (Tungsten Inert Gas) welding process (also known as gas tungsten arc welding, GTAW, or HELIARC, a trade name of Linde) generates heat from an electric arc maintained between a non consumable tungsten electrode and the part being welded. This process was developed for the aircraft industry back in the early '40s. TIG may be used without the addition of a filler metal or a separate wire filler metal can be added into the puddle when additional material is required, much like the process in oxy-acetylene welding. The puddle, the tungsten electrode and the filler rod are protected from atmosphere by a shield of inert gas to prevent rapid oxidation of the weld and surrounding metal. Argon is the most widely utilized gas. Because the gas shield does not produce the slag that normally is created by flux, the danger of slag inclusion in the weld metal is eliminated. Also, due to the slow speed of the TIG process, gases and other impurities escape to the surface of the puddle before solidification occurs, eliminating pockets called "Porosity" common in weld processes that employ gas shielding but have greater travel speeds than the TIG process. TIG also produces a welding heat is that is confined between the weld and base metal at the point of fusion and produces a narrow heat affected zone. This reduces stress, cracking and distortion in the finished weld. Spatter is not produced by this process, leaving the weld and surrounding metal clean. Because of the lack of spatter and flux smoke, the TIG process allows the operator a clear view of the weld puddle. The torch body in most cases is small enough that the operator can hold it in the same manner as he would hold a pencil allowing easier manipulation. The power source is constant current, either AC, DC, or combination AC/DC. Type of metal determines which type is used. DC (direct current) is most normally used for TIG welding of stainless steels and mild and low alloy steels. AC (Alternating current) is used for TIG welding of aluminum. Surface oxidation is automatically removed by the action of the arc each time the electrode becomes positive, (60 times per. second). Because AC crosses over the zero volt point 120 times per second (once going positive and once going negative each cycle), the arc shuts off 120 times per second. To keep the arc going when using AC, a high frequency "arc stabilizer" is used. The high frequency also allows the start of an arc in DC mode without having to "strike" an arc, thereby reducing the possibility of tungsten contamination. If the electrode accidentally touches the weld pool, it becomes contaminated and must be cleaned immediately to prevent weld contamination. TIG requires an extremely clean surface to weld successfully and is a fairly slow operation. On the plus side, TIG produces high quality work and does not generate slag or spatter. The welder can adjust the heat input while welding by using foot or hand amperage controls.
B*a*n*n*e*d
Joined: Feb 2003
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From: chicago, il
Re: (MrMacros)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by MrMacros »</TD></TR><TR><TD CLASS="quote">https://honda-tech.com/zerothread?id=1022836
The TIG (Tungsten Inert Gas) welding process (also known as gas tungsten arc welding, GTAW, or HELIARC, a trade name of Linde) generates heat from an electric arc maintained between a non consumable tungsten electrode and the part being welded. This process was developed for the aircraft industry back in the early '40s. TIG may be used without the addition of a filler metal or a separate wire filler metal can be added into the puddle when additional material is required, much like the process in oxy-acetylene welding. The puddle, the tungsten electrode and the filler rod are protected from atmosphere by a shield of inert gas to prevent rapid oxidation of the weld and surrounding metal. Argon is the most widely utilized gas. Because the gas shield does not produce the slag that normally is created by flux, the danger of slag inclusion in the weld metal is eliminated. Also, due to the slow speed of the TIG process, gases and other impurities escape to the surface of the puddle before solidification occurs, eliminating pockets called "Porosity" common in weld processes that employ gas shielding but have greater travel speeds than the TIG process. TIG also produces a welding heat is that is confined between the weld and base metal at the point of fusion and produces a narrow heat affected zone. This reduces stress, cracking and distortion in the finished weld. Spatter is not produced by this process, leaving the weld and surrounding metal clean. Because of the lack of spatter and flux smoke, the TIG process allows the operator a clear view of the weld puddle. The torch body in most cases is small enough that the operator can hold it in the same manner as he would hold a pencil allowing easier manipulation. The power source is constant current, either AC, DC, or combination AC/DC. Type of metal determines which type is used. DC (direct current) is most normally used for TIG welding of stainless steels and mild and low alloy steels. AC (Alternating current) is used for TIG welding of aluminum. Surface oxidation is automatically removed by the action of the arc each time the electrode becomes positive, (60 times per. second). Because AC crosses over the zero volt point 120 times per second (once going positive and once going negative each cycle), the arc shuts off 120 times per second. To keep the arc going when using AC, a high frequency "arc stabilizer" is used. The high frequency also allows the start of an arc in DC mode without having to "strike" an arc, thereby reducing the possibility of tungsten contamination. If the electrode accidentally touches the weld pool, it becomes contaminated and must be cleaned immediately to prevent weld contamination. TIG requires an extremely clean surface to weld successfully and is a fairly slow operation. On the plus side, TIG produces high quality work and does not generate slag or spatter. The welder can adjust the heat input while welding by using foot or hand amperage controls. </TD></TR></TABLE>
nice post
The TIG (Tungsten Inert Gas) welding process (also known as gas tungsten arc welding, GTAW, or HELIARC, a trade name of Linde) generates heat from an electric arc maintained between a non consumable tungsten electrode and the part being welded. This process was developed for the aircraft industry back in the early '40s. TIG may be used without the addition of a filler metal or a separate wire filler metal can be added into the puddle when additional material is required, much like the process in oxy-acetylene welding. The puddle, the tungsten electrode and the filler rod are protected from atmosphere by a shield of inert gas to prevent rapid oxidation of the weld and surrounding metal. Argon is the most widely utilized gas. Because the gas shield does not produce the slag that normally is created by flux, the danger of slag inclusion in the weld metal is eliminated. Also, due to the slow speed of the TIG process, gases and other impurities escape to the surface of the puddle before solidification occurs, eliminating pockets called "Porosity" common in weld processes that employ gas shielding but have greater travel speeds than the TIG process. TIG also produces a welding heat is that is confined between the weld and base metal at the point of fusion and produces a narrow heat affected zone. This reduces stress, cracking and distortion in the finished weld. Spatter is not produced by this process, leaving the weld and surrounding metal clean. Because of the lack of spatter and flux smoke, the TIG process allows the operator a clear view of the weld puddle. The torch body in most cases is small enough that the operator can hold it in the same manner as he would hold a pencil allowing easier manipulation. The power source is constant current, either AC, DC, or combination AC/DC. Type of metal determines which type is used. DC (direct current) is most normally used for TIG welding of stainless steels and mild and low alloy steels. AC (Alternating current) is used for TIG welding of aluminum. Surface oxidation is automatically removed by the action of the arc each time the electrode becomes positive, (60 times per. second). Because AC crosses over the zero volt point 120 times per second (once going positive and once going negative each cycle), the arc shuts off 120 times per second. To keep the arc going when using AC, a high frequency "arc stabilizer" is used. The high frequency also allows the start of an arc in DC mode without having to "strike" an arc, thereby reducing the possibility of tungsten contamination. If the electrode accidentally touches the weld pool, it becomes contaminated and must be cleaned immediately to prevent weld contamination. TIG requires an extremely clean surface to weld successfully and is a fairly slow operation. On the plus side, TIG produces high quality work and does not generate slag or spatter. The welder can adjust the heat input while welding by using foot or hand amperage controls. </TD></TR></TABLE>
nice post
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