The variety of shielding gases used in arc welding can be a confusing topic. However, the use of an external shielding gas is a necessary component for some processes, as it is a requirement for surrounding and protecting the arc and molten weld metal from contamination by the atmosphere.
Consonant Digraphs. Second Grade. Spelling/Phonics. Consonant Digraphs Consonant digraphs are two (or three) letters that come together to make one sound. The difference between blends and digraphs is that blends are two letters that make two sounds and digraphs make one sound.onsonant Digraphs. Second Grade. Spelling/Phonics. Consonant Digraphs Consonant digraphs are two (or three) letters that come together to make one sound. The difference between blends and digraphs is that blends are two letters that make two sounds and digraphs make one sound.
1 If three letters together represent a single sound, they constitute a trigraph, such as tch in catch and sch in schmaltz. 2  Similarly, to take the consonant trigraph t c h, the teacher can explain that in this word the three letters together âsayâ the sound. Similarly, to take the consonant trigraph t c h, the teacher can explain that in this word the three letters together âsayâ the sound. 2  Both digraphs and trigraphs in French have their origin in history and phonology.