{"id":30976,"date":"2026-07-17T08:44:54","date_gmt":"2026-07-17T06:44:54","guid":{"rendered":"https:\/\/www.lampert.info\/micro-welding\/"},"modified":"2026-07-31T17:43:39","modified_gmt":"2026-07-31T15:43:39","slug":"micro-welding","status":"publish","type":"post","link":"https:\/\/www.lampert.info\/en\/micro-welding\/","title":{"rendered":"Micro-welding and precision welding: processes, applications, and equipment selection"},"content":{"rendered":"\t\t
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Micro-welding and precision welding: processes, applications, and equipment selection<\/h1>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Micro welding<\/strong> is the collective term for welding processes that permanently join thin or delicate metal parts. Common synonyms include precision welding<\/strong>, micro TIG welding, micro pulse welding, pulse arc welding, and TIG welding. The most common cutoff is for material thicknesses under 0.5 mm; this is how the U.S. welding institute EWI defines the field of microjoining. The core of this field comprises five processes: micro-TIG\/pulse arc welding, laser welding, micro-resistance welding, electron beam welding, and ultrasonic welding. The choice of technique depends on workpiece thickness, quantity, material, accessibility, and budget. <\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t

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What is considered micro-welding?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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There is no binding standard for the umbrella term. The American Welding Society does not list micro-welding as a separate process. Instead, experts use size limits, which vary depending on the source: <\/p>
Source<\/th>Delimitation<\/th><\/tr><\/thead>
EWI (term \u201cMicrojoining\u201d)<\/strong><\/td>Material thickness less than 0.5 mm; includes welding, soldering, brazing, and bonding<\/td><\/tr>
Technical literature<\/strong><\/td>Weld width less than 0.5 mm or heat-affected zone less than 100 \u00b5m; not listed as a separate process by the AWS<\/td><\/tr>
DVS technical Note 3224<\/strong><\/td>Laser welding: material thickness \u2264 100 \u00b5m for both workpieces; applies only to the laser process<\/td><\/tr>
Manufacturing practice<\/strong><\/td>Pragmatically, everything below traditional welding methods, from approximately 5 mm down to 0.007 mm<\/td><\/tr><\/tbody><\/table>

Microwelding, precision welding, …: one field, different names<\/h3>

Several terms for this kind of welding are used interchangeably and they are known as micro welding, pulse arc welding, micro TIG welding, or micro GTAW (U.S.: gas tungsten arc welding). Micro-TIG and micro-pulse welding refer to a specific process within this family: the pulsed arc.
People who search for one of these terms are usually looking for the same thing.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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The five core processes<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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1. Micro-TIG welding \/ pulsed arc welding<\/h3>\n

A very short arc between a non-consumable tungsten electrode and the workpiece melts the material at specific points, under an inert gas. The general technical literature classifies the micro-TIG process category as having weld areas under 18 mm\u00b2 and a current range of 5 to 300 A. This value describes the process class in the literature, not a device limit: industrial devices such as the Micro Arc Welder can reach up to 1,200 A. Lampert devices operate with pulse durations ranging from 0.1 to 34 ms and produce weld spots with diameters ranging from 0.2 to 4.0 mm; the welding process proceeds automatically upon contact with the tungsten electrode. The article on the Lampert welding principle<\/a> explains how the pulse is generated. <\/p>\n

2. Laser welding<\/h3>\n

A focused fiber or YAG laser beam performs contactless welding with a very narrow heat-affected zone and high cycle rates. However, this process requires radiation protection (laser safety class 4) and a significantly higher investment.  <\/p>\n

3. Micro-resistance welding<\/h3>\n

Electric current combined with electrode pressure creates the weld spot directly at the joint (spot or seam welding). The process is fast and cost-effective and is therefore often used as the standard in high-volume production. It generally requires access to the workpiece from both sides. <\/p>\n

4. Electron beam micro-welding<\/h3>\n

Maximum precision in a vacuum, a special case for small-batch production with extreme requirements, such as when working with reactive specialty materials. Due to the vacuum chamber at the high end of the process family, the investment is often in the six-figure range. <\/p>\n

5. Ultrasonic welding \/ wire bonding<\/h3>\n

A solid-state process without melting: ultrasound and pressure bond the joining partners together. In semiconductor manufacturing, wire bonding is the standard; nearly 90 percent of all chip connections are made this way. <\/p>\n

In addition, some sources mention less common processes such as percussion welding, thermocompression, and micro-plasma. In practice, however, the five core processes are often the deciding factor in process selection. <\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Comparison of methods<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Procedure<\/th>Workpiece thickness<\/th>Suitability for small quantities<\/th>Range of materials<\/th>Investment<\/th>Mobility<\/th>Automation<\/th><\/tr><\/thead>
Micro-TIG \/ pulsed arc<\/strong><\/td>0.1 mm and up; core range 0.1\u20131.0 mm<\/td>Single units, repairs, prototypes, and small-batch production<\/td>Very broad: steels, titanium, nickel-based alloys, precious metals, copper; aluminum with aluminum mode<\/td>low,Micro Arc Welder setup starting at approx. 7,000\u20ac<\/td>High: handpiece moves toward the workpiece; workpiece size is unlimited<\/td>possible (i.e., program memory, Modbus TCP\/IP)<\/td><\/tr>
Lasers (fiber\/YAG)<\/strong><\/td>Less than 0.1 mm possible; DVS 3224: \u2264 100 \u00b5m<\/td>Small-batch to mass production, high cycle rates<\/td>very wide; highly reflective precious metals are challenging<\/td>High,ranging from approximately 15,000\u20ac to 500,000\u20ac, plus Class 4 laser safety requirements<\/td>Low: stationary, enclosure required<\/td>Very good, standard in production lines<\/td><\/tr>
Micro-resistance (spot\/seam)<\/strong><\/td>Films, thin sheets, wires, tabs<\/td>High-volume production, very short cycle times<\/td>Sheet metal, wire, and tab connections; access from both sides required<\/td>low, starting at approx. 4,000\u20ac<\/td>low: asset-related<\/td>very good<\/td><\/tr>
electron beam<\/strong><\/td>the finest textures<\/td>Small-batch production with extreme requirements<\/td>including reactive specialty materials (vacuum process)<\/td>high,starting at approx. 400,000\u20ac<\/td>None: vacuum chamber<\/td>within the facility<\/td><\/tr>
Ultrasonics \/ wire bonding<\/strong><\/td>Wires typically under 50 \u00b5m, foils<\/td>Mass production of semiconductors<\/td>Wire bonding; solid-state process without melting<\/td>Semiconductor production equipment<\/td>None: bonder system<\/td>fully automatic<\/td><\/tr><\/tbody><\/table>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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When to use which method?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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The decision-making logic as an “if-then” list:<\/p>\n