It isn't.
It's called soldering when you join two pieces of metals together using a 3rd metal with a very low melting point. Welding, then both the "parent" metals and the added metals are melted. Usually at a lot higher temperature.
solder--its an alloy used 4 joining metals
Solder is a metal alloy that is fusible. The kind typically used in electrical soldering melts at 370 degrees Fahrenheit, which is equivalent to 188 degrees Celsius.
Solder has a relatively low melting point, and it wets many different metals allowing it to be used to join (solder) them together. It is also fairly resistant to corrosion when the correct solder alloy is applied to the work. We see a lot of solder used in electrical and electrical applications, so it's a fairly good electrical conductor.
You clean both surfaces to be joined with a circular steel brush, then heat and 'tin' each piece, with the larger piece being second. When the larger piece is tinned and still warm, insert the small piece into it and seal the rim by running solder all round it..
Solder. It is an alloy of lead and tin, with a (relatively) low melting point. It only works with Copper or lead pipes.
solder is an alloy of tin and led used for fixing some joints
solder.
There are several different alloys used for this purpose, depending on the requirements:solder, used in a process called soldering where low temperatures are required to avoid damage and the alloy does not need to provide strength to the joint (solder is traditionally an alloy of tin & lead but many modern solders have been reformulated to replace the lead with nontoxic metals)brass, used in a process called brazing where it is undesirable to melt the parts being joined but the alloy must provide strength to the joint (brass is an alloy of copper and zinc)alloys similar to that used in the parts themselves, used in a process called welding where both the alloy and the parts are melted and commingled to provide a joint as strong as the original metal parts themselves
You may be refering to the term SOLDER. If so it is used when soldering NOT welding.
Solder Also Pewter is a malleable metal alloy, traditionally 85-99% tin, with the remainder consisting of copper, antimony, bismuth and lead.
Solder ( an alloy of Lead and Tin) is used to make fuse wire because of its very low melting point.
Solder is a eutectic alloy used for bonding two pieces of metal together.
solder--its an alloy used 4 joining metals
Super Alloy 1 Multi-Metal and Pot Metal Solder. I think
Solder is a metal alloy that is fusible. The kind typically used in electrical soldering melts at 370 degrees Fahrenheit, which is equivalent to 188 degrees Celsius.
Usually an alloy of tin/lead - though there are others (silver for example, used in repairing jewellery)
No Alloy is used. Mild Steel is the most common metal used for railway tracks due to its' relatively low cost and compatibility for generqal welding, workability and strength, compared to all other metals.