1.1.7 Thermal Joint: Welding

Welding is used to join similar metals. Welding produces a very strong joint and is generally suited to large assemblies where both metal sections are relatively thick (>= 12.7mm (0.5 in)). Welding creates a localised joint and is not suitable for broad areas. Welded joints are considered permanent as disassembly is impractical or impossible. Because the base material is melted, the part may undergo deformation, internal stresses and undesirable cosmetic effects. The ductility and toughness of the base material may be locally affected. Welding requires skilled labour and knowledge of basic physics, chemistry and metallurgy principles. Highly flammable gases and/or specialised equipment are also required. Welding is not suitable for small items.

Figure 13 A weld can create large internal stresses, leading to deformation of the material

1.1.8 Thermal Joint: Soldering

Soldering joins metal parts with a molten filler metal rather than melting the base material of the part. Solder is typically a tin or lead alloy that melts at temperatures below 350°C (662°F), causing less thermal stress than welding. Melted solder is drawn by capillary action between metal surfaces. It is electrically conductive, suitable for small parts and may be reworked at relatively low temperatures, which makes it a popular choice for electronics.

Figure 14 Soldering and joining metal contacts in electronics

Table of contents

Already have an account? Sign in

+33,000
professionals

have already
signed up

Award winning manual

Platinum Award for LOCTITE®X Digital Manual

The Digital Manual is for professionals by professionals

The manual is made entirely for you. However, if you’re still not convinced that free industry knowledge is for you, take a look at these user testimonials from the users of the manual.

"The topics are such that I can help take design related decisions very well at work. It's an interesting and knowledgeable read, I recommended my other colleagues to have a look at the manual as well."

Hanumant, Production Incharge

"The manual's chapters significantly enhanced my comprehension of various engineering topics. The manual adeptly presents explanations and examples of concepts, showcasing a high level of clarity and effectiveness in its content."

Tejas, Mechanical Engineer from a renowned Engineering College

"The release of this manual by a renowned brand such as Loctite has proven to be highly motivating for students. Its authentic content serves as a source of inspiration, encouraging students to engage actively in reading and learning."

Padmakar Deshmukh, Professor at an Engineering College